PortSIP Knowledge Base
  • PortSIP Communications Solution
    • What is PortSIP?
    • The Advantages of PortSIP PBX vs. Other PBXs
    • PortSIP PBX Administration Guide
      • Overview
      • PortSIP Security Features
      • Summary of Changes
      • Before Started
      • 1 Installation of the PortSIP PBX
        • Installation of PortSIP PBX v22.x
          • Install PortSIP PBX on Linux
          • Install PortSIP IM Server on Linux
          • Install PortSIP PBX on Windows
          • Upgrade to the Latest Version Within v22.x on Linux
          • Upgrade to the Latest v22.x on Windows
          • Upgrade v16.x to the Latest v22.x on Linux
        • Installation of PortSIP PBX v16.x
          • Upgrade to the Latest v16.x Release
      • 2 Configuring the PortSIP PBX
      • 3 Tenant Management
        • Password and Sign-In Security
      • 4 Phone Device Management
        • Managing Phones
        • Auto Provisioning Security
        • Custom IP Phone Template
        • Bulk Importing Users and Auto Provisioning IP Phones
        • Zero Touch Provisioning Phones
        • Provision Phone Using PnP
        • PnP Auto Provisioning IP Phone Multicast Debug
        • Provision Phone Using RPS
        • Provision Phone Using DHCP Option 66
        • Provision Phone Using TFTP
        • Provisioning Cisco 79xx IP Phones
        • Provision Fanvil DECT IP Phones
        • Provision Yealink DECT IP Phones
        • Provision SNOM DECT IP Phones
        • Configuring Private RPS Account
      • 5 User Management
        • Users
        • How to Configure the Endpoints?
        • User Groups
        • DND and Automatic Callback
        • Speed Dial 8
        • Speed Dial 100
      • 6 Transport Management
      • 7 Trunk Management
        • Configuring SIP Trunk
        • Handle Outbound Calls Through SIP Trunk
      • 8 Call Route Management
        • Configuring Inbound Rule
        • Configuring Outbound Rule
      • 9 Configuring PortSIP SBC
        • Topology
        • Summary of Changes
        • Installation PortSIP SBC v11.x
        • Installation PortSIP SBC v10.x
        • Configuring PortSIP SBC for WebRTC
        • Upgrade to the Latest v11.x Release
        • Upgrade to the Latest v10.x Release
      • 10 Configuring SBC for MS Teams
        • Architecture
        • Configuring Microsoft Teams
        • Configuring SBC and PBX
        • Configure an SBC for Multiple Tenants
      • 11 Deploy the SBC Cluster
      • 12 Configuring Virtual Receptionist
        • Managing Virtual Receptionist
        • Visual IVR Editor Guide
        • Direct Inward System Access (DISA)
      • 13 Configuring Ring Group
      • 14 Call Parking
        • PortSIP Call Parking Feature
        • Using Call Parking Feature
        • Using Enhanced Call Park on Fanvil IP Phones
        • Using Enhanced Call Park on Yealink IP Phones
        • Using Enhanced Call Park on Grandstream IP Phones
        • Using Enhanced Call Park on SNOM IP Phones
        • Using Enhanced Call Park on Dinstar IP Phones
        • Using Enhanced Call Park on Htek IP Phones
      • 15 Shared Voicemail
      • 16 Call Queue
        • Configuring Call Queue
        • Configuring Queue Callback
        • Agent States and Work Modes
        • Skills-Based Routing
        • Silent Monitoring
        • Wallboards
      • 17 Roles and Permissions
      • 18 E164 Number Processing
      • 19 Billing
      • 20 CDR and Call Recordings
        • CDR
        • Call Recordings
        • CDR Field Descriptions
      • 21 Call Reports
      • 22 Dealers
      • 23 Feature Access Codes
      • 24 Call Pickup
      • 25 Meetings
        • Joining a Meeting with the Invite Link
      • 26 Hot Desking
      • 27 STIR/SHAKEN
        • Configuring STIR/SHAKEN
      • 28 Digital Engagement Channels
        • SMS Channel
        • WhatsApp Channel
        • Manage SMS/WhatsApp Message Conversations
      • 29 Integrations
        • Microsoft 365 Integration
        • Google Workspace Integration
      • 30 Office Hours and Holiday Schedule
        • Configuring Office Hours and Holiday Schedule
        • Routing Calls Based on Office Hours and Holidays
      • 31 Configuring Email Notifications
      • 32 Night Mode
      • PBX and SIP Trunk using PortSIP SBC
      • SIP Header Manipulation
      • Rebranding PortSIP PBX, SBC
      • System Service Extension Numbers
      • Certificates for TLS/HTTPS/WebRTC
        • Preparing TLS Certificates
        • Update Certificates
      • Backup and Restore: An Essential Guide
        • Backup and Restore PortSIP PBX
        • Backup and Restore PortSIP SBC
      • Storing Into AWS S3
      • Storing Into Azure Blob Storage
      • Trace Server - A Better Way to Monitoring SIP Messages and QoS for PortSIP PBX
    • Configuring SIP Trunks
      • QuestBlue SIP Trunk
        • Purchase a DID on QuestBlue Platform
        • Configuring QuestBlue IP Authentication Trunk
        • Configuring QuestBlue Register Authentication Trunk
        • Configuring Outbound & Inbound Calls
        • QuestBlue SMS Integration
      • Twilio SIP Trunk
        • Purchase a DID on the Twilio
        • Configuring Twilio Register Based Trunk
        • Configuring Twilio Interconnect Trunk
        • Configuring Outbound & Inbound Calls
        • Twilio SMS Integration
      • Telnyx SIP Trunk
        • Purchase a DID on Telnyx Platform
        • Configuring Telnyx IP Authentication Trunk
        • Configuring Telnyx Register Authentication Trunk
        • Configuring Outbound & Inbound Calls
        • Telnyx SMS Integration
      • Vonage SIP Trunk
        • Purchase a DID on Vonage Platform
        • Configuring Vonage IP Authentication Trunk
        • Configuring Vonage Register Authentication Trunk
        • Configuring Outbound & Inbound Calls
        • Vonage SMS Integration
      • VoIP.ms SIP Trunk
        • Purchase a DID on VoIP.ms
        • Configuring VoIP.ms Register Based Trunk
        • Configuring Outbound & Inbound Calls
        • VoIP.ms SMS Integration
      • Voxtelesys SIP Trunk
        • Purchase a DID on Voxtelesys Platform
        • Configuring Voxtelesys IP Authentication Trunk
        • Configuring Voxtelesys Register Authentication Trunk
        • Configuring Outbound & Inbound Calls
        • Voxtelesys SMS Integration
      • Wavix SIP Trunk
        • Purchase a DID on Wavix Platform
        • Configuring Wavix IP Authentication Trunk
        • Configuring Wavix Digest Trunk
        • Configuring Outbound & Inbound Calls
        • Wavix SMS Integration
      • VoIP Innovations SIP Trunk
        • Purchase a DID on VoIP Innovations Platform
        • Configuring VoIP Innovations IP Authentication Trunk
        • Configuring Outbound & Inbound Calls
        • VoIP Innovations SMS Integration
      • Bandwidth SIP Trunk
        • Purchase a DID on Bandwidth Platform
        • Configuring Bandwidth IP Authentication Trunk
        • Configuring Outbound & Inbound Calls
        • Bandwidth SMS Integration
      • Flowroute SIP Trunk
        • Purchase a DID on Flowroute Platform
        • Configuring Flowroute IP Authentication Trunk
        • Configuring Outbound & Inbound Calls
        • Flowroute SMS Integration
      • Gamma SIP Trunk
      • Aire Networks SIP Trunk
      • VoiceMeUp SIP Trunk
        • Configuring VoiceMeUp Trunk
        • VoiceMeUp SMS Integration
    • PBX Cluster (v22.x)
      • Topology
      • Preparing Cluster Servers
      • Configuring Cluster Servers
      • Managing Cluster
    • High Availability (v22.x)
      • High Availability and Sclability On-Premise
        • PortSIP PBX High Availability Architecture
        • High Availability Installations on Ubuntu
        • Upgrading High Availability Installation
        • Scaling Servers On-Premise for High Availability
        • Scaling SBC On-Premise for High Availability
        • Scaling IM Server On-Premise for High Availability
      • High Availability and Scalability on AWS
        • PortSIP PBX High Availability Architecture
        • High Availability Installations on AWS
        • Upgrading High Availability Installation
        • Increase Size of EBS Volume
        • Scaling Servers on AWS for High Availability
    • PBX Cluster(v16.x)
      • Topology
      • Preparing Cluster Servers
      • Configuring Cluster Servers
      • Managing Cluster
      • Configuring Cluster Servers for High Availability
    • High Availability (v16.x)
      • High Availability for On-Premise
        • PortSIP PBX High Availability Architecture
        • High Availability Installations on Ubuntu
        • Upgrading High Availability Installation
      • High Availability and Scalability on AWS
        • PortSIP PBX High Availability Architecture
        • High Availability Installations on AWS
        • Upgrading High Availability Installations
        • Increase Size of EBS Volume
        • Scaling Servers on AWS for HA
    • FAQ
      • Troubleshooting Call Issues
      • How to Activate License key?
      • What File Format Is Required for PortSIP PBX Prompt?
      • What is the Multi-Tenant PBX?
      • Is the PortSIP PBX built on Asterisk, FreeSwitch?
      • What is the SBC?
      • What is the PBX? Features, Benefits
      • What is Direct Inward Dialing (DID)?
      • What is the DID Pool?
      • What are IP Phones Work with PortSIP PBX?
      • Hardware Specifications
      • How to Adjust the REST API Rate Limit?
      • SIP Status Code of Response
      • What is SIP ALG and Why You Need to Disable It?
      • Essential Factors for Choosing a Could PBX Solution
      • Migrate from legacy FCM APIs to HTTP v1 for Android Push Notifications
      • PortSIP SDK License Agreement
      • PortSIP Software End-User License Agreement
    • Simplifying Unified Communications with WebRTC and SIP
    • CPaaS vs. UCaaS: What’s the Difference and How to Choose?
    • What is CPaaS? Communications Platform as a Service Explained
    • UCaaS is Unified Communications as a Service
    • Understanding CPaaS: What it is and What it Requires
    • Cloud PBX Empowering Service Providers
  • Apps Guides
    • PortSIP ONE Desktop App
      • Sign in to PBX
      • Calls, Messages, and Voicemails
      • Customize Your Caller ID
      • SMS and WhatsApp Messaging
      • Click to Call
      • Calling from Another Device
      • Change Your Call Queue Status
    • PortSIP ONE Mobile App
      • Sign in to PBX
      • Calls, Messages, and Voicemails
      • Customize Your Caller ID
      • SMS and WhatsApp Messaging
      • Change Your Call Queue Status
    • PortSIP Softphone
  • DEVELOPING WITH PORTSIP
    • Getting Started
    • Calling APIs
      • User Manual for Windows
      • User Manual for iOS
      • User Manual for Android
      • User Manual for macOS
    • REST APIs
      • Version 22.2
        • Get Started
          • Schema
          • Authentication and Authorization
          • HTTP verbs
          • Summary Representations
          • Resource ID
          • Query Options Overview
          • Detailed representations
          • Timezones
          • API Response
          • Error Handling
          • Resource Synchronization
          • Personal Contacts Synchronization
        • Authentication
        • Administrations
        • Extensions
        • Authentication
        • Tenants
        • Call Queues
        • Billing
        • CTI
        • Call Sessions
        • Call Detail Records
        • Conference
        • Contact
        • Emergency Numbers
        • Extensions
        • Files
        • Blobs
        • Trunks
        • Inbound Rules
        • Outbound rules
        • Virtual Receptionists
        • Media Server
        • MOH
        • Automatic Callback
        • Auto Provisioning
        • Push Notification
        • Ring Groups
        • Shared Voicemails
        • Security
        • Feature Access Codes
        • Voicemails
        • Call Park
        • Call Pickup
        • Hot Desking
        • External Message
        • Notification
        • Troubleshooting
        • Microsoft 365
        • Models
      • Version 22.1
        • About
        • API reference
          • Info
          • Login
            • By microsoft
          • Logout
          • Network
          • Sbc
            • Token
              • Destroy
          • Im
            • Token
              • Destroy
          • Dealers
            • Password
            • Destroy
          • Mobile push
            • Destroy
          • Ip filters
            • Destroy
            • Export
          • Transports
            • Destroy
            • Status
          • Tenants
            • Switch
            • Dealers
              • Destroy
            • Destroy
          • Tenant
            • Status
            • Notification
              • Test email
            • Password policy
            • Billing
            • Balance
            • Custom headers
          • Conference servers
            • Status
            • Destroy
          • Media servers
            • Status
            • Destroy
          • License
          • Key
          • Brand
          • Dealer
            • Status
            • Username
            • Password
          • Roles
            • Destroy
          • User
            • Password
            • Extension password
            • Profile
            • Status
            • Presence
            • Balance
            • Greetings
              • Enable
              • Disable
              • Destroy
            • Phones
              • Destroy
            • Cdrs
              • Sync tokens
                • Diff
            • External messages
            • Recordings
              • Destroy
            • Speed dial 8
              • Destroy
            • Speed dial 100
              • Destroy
            • Meetings
              • Destroy
              • Status
              • Mute
              • Unmute
              • Lock
              • Unlock
              • Start
              • Stop
              • Start recording
              • Stop recording
              • Participants
                • Layout
                • Invite
                • Mute
                • Unmute
                • Chairman
                • Position
                • Destroy
            • Holidays
              • Destroy
            • Global holidays
            • Contacts
              • Favorite
              • Unfavorite
              • Destroy
              • Sync tokens
                • Diff
            • Call queues
              • Agent
            • Outbound caller ids
            • Ring groups
            • Business contacts
              • Favorite
              • Unfavorite
              • Sync tokens
                • Diff
            • Extension contacts
              • Favorite
              • Unfavorite
              • Sync tokens
                • Diff
          • Users
            • Profile
            • Password
            • Extension password
            • Role
            • Ms365 binding
              • Destroy
            • Destroy
            • Status
              • Destroy status
            • Balance
            • Greetings
              • Enable
              • Disable
              • Destroy
            • Phones
              • Destroy
            • Holidays
              • Destroy
            • Global holidays
            • Call queues
              • Agent
            • Speed dial 8
              • Destroy
            • Speed dial 100
              • Destroy
          • Extension numbers
          • Groups
            • Destroy
            • Members
              • Destroy
          • Voicemails
            • Set read
            • Set unread
            • Destroy
          • Recordings
            • Destroy
          • Call queue servers
            • Status
            • Destroy
          • Call queues
            • Status
            • Destroy
            • Waiting
              • Pickup
            • Agents
          • Exclusive numbers
            • Destroy
            • Call queues
              • Agents
              • Destroy
            • Export
          • Vip numbers
            • Destroy
            • Export
          • Call queue blacklisted numbers
            • Destroy
            • Export
          • Call queue blacklist prompts
          • Sessions
            • Directly
            • Hold
            • Unhold
            • Refer
            • Attended refer
            • Destroy
          • Conference rooms
            • Destroy
            • Status
            • Mute
            • Unmute
            • Lock
            • Unlock
            • Start recording
            • Stop recording
            • Participants
              • Layout
              • Invite
              • Mute
              • Unmute
              • Chairman
              • Position
              • Destroy
            • Recordings
              • Destroy
              • Set read
              • Set unread
          • Contacts
            • Destroy
            • Export
          • Emergency numbers
            • Destroy
          • Files
            • Destroy
          • Blobs
            • Uploads
              • Append
              • Complete
              • Status
              • Destroy
          • Inbound rules
            • Destroy
            • Export
          • Moh server
            • Musics
              • Destroy
          • Monitor
          • Monitor groups
            • Destroy
            • Members
              • Destroy
            • Managers
              • Destroy
          • Call park
          • Call park groups
            • Destroy
            • Members
              • Destroy
          • Call pickup groups
            • Destroy
            • Members
          • Voicemail
          • Acb
          • Outbound rules
            • Destroy
            • Export
            • Applied groups
              • Destroy
          • Phone models
          • Phones
            • Reprovision
            • Assignee
            • Reboot
            • Reject
          • Dect phone models
          • Dect phones
            • Destroy
            • Members
          • Providers
            • Status
            • Destroy
            • Export
            • Assignees
              • Destroy
          • Ring groups
            • Agents
            • Destroy
          • Shared voicemails
            • Destroy
            • Voicemails
              • Set read
              • Set unread
              • Destroy
            • Greetings
              • Enable
              • Disable
              • Destroy
          • Holidays
            • Destroy
          • Allowed country codes
          • Disallowed codes
            • Destroy
            • Export
          • Blacklisted numbers
            • Destroy
            • Export
          • Call rates
            • Destroy
            • Export
          • Ivr servers
            • Status
            • Destroy
          • Ivrs
            • Status
            • Destroy
            • Action urls
              • Destroy
          • Hotdesking
            • Status
            • Logout
            • Destroy
          • Sms
            • Destroy
          • Whatsapp
            • Destroy
          • Cdrs
          • Calllogs
          • External messages
          • Call reports
            • Destroy
          • Completed call reports
            • Destroy
          • Feature access codes
          • Default email templates
          • Custom email templates
          • Audit logs
          • Event logs
          • Ms365
            • Certificate
            • Users
          • Google
          • Admin
            • Status
            • Username
            • Password
            • Settings
            • Notification
              • Test email
            • Ms365
              • Certificate
            • Google
          • Templates
            • Phones
              • Destroy
        • Specification
      • Version 22.0
        • About
        • API reference
          • Info
          • Login
            • By microsoft
          • Logout
          • Network
          • Sbc
            • Token
              • Destroy
          • Im
            • Token
              • Destroy
          • Dealers
            • Password
            • Destroy
          • Mobile push
            • Destroy
          • Ip filters
            • Destroy
            • Export
          • Transports
            • Destroy
            • Status
          • Tenants
            • Switch
            • Dealers
              • Destroy
            • Destroy
          • Tenant
            • Status
            • Notification
            • Password policy
            • Billing
            • Balance
            • Custom headers
          • Conference servers
            • Status
            • Destroy
          • Media servers
            • Status
            • Destroy
          • License
          • Key
          • Brand
          • Dealer
            • Status
            • Username
            • Password
          • Roles
            • Destroy
          • User
            • Password
            • Extension password
            • Profile
            • Status
            • Presence
            • Balance
            • Greetings
              • Enable
              • Disable
              • Destroy
            • Phones
              • Destroy
            • Cdrs
              • Sync tokens
                • Diff
            • Recordings
              • Destroy
            • Speed dial 8
              • Destroy
            • Speed dial 100
              • Destroy
            • Meetings
              • Destroy
              • Status
              • Mute
              • Unmute
              • Lock
              • Unlock
              • Start
              • Stop
              • Start recording
              • Stop recording
              • Participants
                • Layout
                • Invite
                • Mute
                • Unmute
                • Chairman
                • Position
                • Destroy
            • Holidays
              • Destroy
            • Global holidays
            • Contacts
              • Favorite
              • Unfavorite
              • Destroy
              • Sync tokens
                • Diff
            • Call queues
              • Agent
            • Outbound caller ids
            • Ring groups
            • Business contacts
              • Favorite
              • Unfavorite
              • Sync tokens
                • Diff
            • Extension contacts
              • Favorite
              • Unfavorite
              • Sync tokens
                • Diff
          • Users
            • Profile
            • Password
            • Extension password
            • Role
            • Ms365 binding
              • Destroy
            • Destroy
            • Status
              • Destroy status
            • Balance
            • Greetings
              • Enable
              • Disable
              • Destroy
            • Phones
              • Destroy
            • Holidays
              • Destroy
            • Global holidays
            • Call queues
              • Agent
            • Speed dial 8
              • Destroy
            • Speed dial 100
              • Destroy
          • Extension numbers
          • Groups
            • Destroy
            • Members
              • Destroy
          • Voicemails
            • Set read
            • Set unread
            • Destroy
          • Recordings
            • Destroy
          • Call queue servers
            • Status
            • Destroy
          • Call queues
            • Status
            • Destroy
            • Waiting
              • Pickup
            • Agents
          • Exclusive numbers
            • Destroy
            • Call queues
              • Agents
              • Destroy
            • Export
          • Vip numbers
            • Destroy
            • Export
          • Call queue blacklisted numbers
            • Destroy
            • Export
          • Call queue blacklist prompts
          • Sessions
            • Directly
            • Hold
            • Unhold
            • Refer
            • Attended refer
            • Destroy
          • Conference rooms
            • Destroy
            • Status
            • Mute
            • Unmute
            • Lock
            • Unlock
            • Start recording
            • Stop recording
            • Participants
              • Layout
              • Invite
              • Mute
              • Unmute
              • Chairman
              • Position
              • Destroy
            • Recordings
              • Destroy
              • Set read
              • Set unread
          • Contacts
            • Destroy
            • Export
          • Emergency numbers
            • Destroy
          • Files
            • Destroy
          • Blobs
            • Uploads
              • Append
              • Complete
              • Status
              • Destroy
          • Inbound rules
            • Destroy
            • Export
          • Moh server
            • Musics
              • Destroy
          • Monitor
          • Monitor groups
            • Destroy
            • Members
              • Destroy
            • Managers
              • Destroy
          • Call park
          • Call park groups
            • Destroy
            • Members
              • Destroy
          • Call pickup groups
            • Destroy
            • Members
          • Voicemail
          • Acb
          • Outbound rules
            • Destroy
            • Export
            • Applied groups
              • Destroy
          • Phone models
          • Phones
            • Reprovision
            • Assignee
            • Reboot
            • Reject
          • Dect phone models
          • Dect phones
            • Destroy
            • Members
          • Providers
            • Status
            • Destroy
            • Export
            • Assignees
              • Destroy
          • Ring groups
            • Agents
            • Destroy
          • Shared voicemails
            • Destroy
            • Voicemails
              • Set read
              • Set unread
              • Destroy
            • Greetings
              • Enable
              • Disable
              • Destroy
          • Holidays
            • Destroy
          • Allowed country codes
          • Disallowed codes
            • Destroy
            • Export
          • Blacklisted numbers
            • Destroy
            • Export
          • Call rates
            • Destroy
            • Export
          • Ivr servers
            • Status
            • Destroy
          • Ivrs
            • Status
            • Destroy
            • Action urls
              • Destroy
          • Hotdesking
            • Status
            • Logout
            • Destroy
          • Sms
            • Destroy
          • Whatsapp
            • Destroy
          • Cdrs
          • Call reports
            • Destroy
          • Completed call reports
            • Destroy
          • Feature access codes
          • Default email templates
          • Custom email templates
          • Audit logs
          • Event logs
          • Test email
          • Ms365
            • Certificate
            • Users
          • Admin
            • Status
            • Username
            • Password
            • Settings
            • Notification
          • Templates
            • Phones
              • Destroy
        • Specification
      • Authentication
      • Accessing CDRs and Recordings
    • Call Control APIs
    • Messaging APIs
      • Protocol
      • API Examples
    • WSI: Pub/Sub
    • Webhook Events
      • Registering a Webhook
      • Receiving Events via a Webhook
      • Event Reference
    • Mobile Push Notifications
      • How Do Push Notifications Work with PortSIP PBX?
      • Integrating the Push Notifications in Native iOS APP
      • Integrating the Push Notifications in Android APP
  • PBX v12.x (EOL)
    • PortSIP PBX v12.x is EOL
    • High Availability
      • PortSIP PBX High Availability
      • UCaaS High Availability
      • Deploy the PortSIP PBX HA on AWS
      • Deploy PortSIP PBX HA for CentOS
      • Deploy PortSIP PBX HA for Ubuntu
      • Migrate the HA data
    • Push Notifications
      • How do push notifications work with PortSIP PBX?
      • Implement the PUSH notifications in Xamarin iOS APP with PortSIP PBX 12.x
      • Implement the PUSH notifications in native iOS APP with PortSIP PBX 12.x
      • Implement PUSH notifications in Android APP with PortSIP PBX 12.x
      • Implement PUSH notifications in Xamarin Android APP with PortSIP PBX 12.x
    • Tutorials
      • REST API Examples
      • Trace server - A Better Way to Debug PortSIP UC
      • Setup SSL Certificates for HTTPS/WebRTC
      • Going Real-Time with PortSIP PBX Pub/Sub
      • Upgrade PortSIP PBX for offline
      • PortSIP UC Architecture
      • PortSIP PBX Features
      • PortSIP Security Feature
      • Hardware Specifications
      • Setup PortSIP PBX for Linux
      • Upgrade PortSIP PBX
      • Upgrade PortSIP PBX v12.x to the v12.8.7
      • Add Extended Media Server
      • Store the recording files to AWS S3
      • Configure Notifications for Kubernetes
      • Rebranding PortSIP PBX
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On this page
  • What Is a DID number?
  • How Does DID Work?
  • Direct Inward Dialing on VoIP
  • Benefits of Direct-Dialing
  • How Do I Get DID?
  1. PortSIP Communications Solution
  2. FAQ

What is Direct Inward Dialing (DID)?

PreviousWhat is the PBX? Features, BenefitsNextWhat is the DID Pool?

Last updated 1 year ago

Direct Inward Dialing (DID) is when a telephone service provider connects a block of telephone numbers to your company’s (PBX). It allows businesses to set up virtual numbers that can bypass the main reception lines and go directly to a desk extension or group of extensions. DID can be used with local, premium-rate, or toll-free numbers.

Other common names for DID are DDI, direct-dial numbers, direct dial, and direct dial-ins. Essentially, when someone says "Reach me at my direct number,” this is what they’re referring to. In summary, a phone number that is used like this is often called a "DID" (and multiple numbers are called "DIDs”).

In this article, we provide an in-depth look at Direct Inward Dialing, how it works, and its benefits to businesses today.

What Is a DID number?

From the perspective of a customer or client, a direct-dial number looks like any standard telephone number. However, DID is a virtual number that goes directly to an extension or location in your company. Think of it as a shortcut phone line.

These direct-dial phone numbers point inbound calls to an organization’s phone system. The function of relaying callers to an individual user makes that number “direct.” This dedicated call routing is managed by the VoIP phone system.

How Does DID Work?

Traditionally, DID works in one of two ways: through (PSTN) lines or (VoIP). Let’s start with PSTN. In this article, we just focus on VoIP.

Direct Inward Dialing on VoIP

VoIP is the most modern and flexible way to employ virtual direct-dial numbers with the help of SIP trunking. SIP makes the trunk line connections available as-needed. These are not physical lines, but virtual links across broadband only when you require them.

These virtual links are configured internally and the numbers are linked to your extensions by a software application. You can do this yourself or you can have your VoIP provider do it for you.

DID on VoIP is highly scalable. For example, if you decide you’d like to launch a sales campaign next month that requires you to have 20 new trunk lines, you can easily do it yourself. There’s no need to contact your telephone company, wait for them to allocate a block of numbers, and then send out a technician to physically connect the trunk lines to your business PBX.

In the past, you might’ve had to wait weeks to get this set up and the cost would be substantial. Now you can configure it yourself.

VoIP systems have a variety of features that take time to learn. Thankfully, most VoIP providers offer professional onboarding and support. This goes beyond what traditional service providers can offer.

In the above example, calls from the PSTN will be directed to the VoIP user(extension) who holds the corresponding DID number.

Benefits of Direct-Dialing

The benefits of DID apply to every sized business today, including:

  1. Cost savings: With DID, you can reduce the number of trunk lines required to connect your business. With a VoIP system, you can even forward the DIDs to different continents saving long-distance costs.

  2. Time savings: Routing calls to the person directly, without the need for a receptionist or phone menu, saves time. Follow-up becomes easier for customers when their agent has a single number.

  3. Better customer experience: Customers can reach employees when they need them without hurdles. That can be a remarkable experience from the customer’s perspective.

  4. Team communication: Employees can contact team members via a dedicated extension even if they are in different buildings, cities, or even countries.

  5. Local phone numbers: People prefer to call local phone numbers. A business operating in New York can set up a phone number in Miami or London for customers in that market.

  6. Existing equipment: With VoIP, direct-dial ins occur in the telephone network and virtually, you won’t need to buy all new phones or hardware.

  7. Automated call forwarding: You can have your direct-dial line automatically forward incoming calls to your mobile phone or other temporary numbers without the customer knowing these private numbers.

  8. Flexibility: With DID, you have more control over where and when you receive calls. A mobile workforce demands a flexible solution. Combining the power of VoIP, DID, and SIP with mobile phones, email, and SMS equals a more robust telecommunications system for your business.

  9. Time settings: Automatically forward calls to different numbers at given times. This is great for after-hours support for different time zones, especially for global teams.

  10. Marketing attribution: By assigning different numbers to different marketing campaigns, you can accurately track the performance of each campaign.

How Do I Get DID?

Give your customers and vendors a way to reach people and departments in your company with a Direct Inward Dialing phone number. DID allows inbound callers to skip the phone tree and bypass call queues.

The first step is to obtain one or more business phone numbers. It’s likely you already have some business phone numbers. You can transfer these through a method known as porting.

Next, you would assign these to each user in your phone system. This can be done from the administrative dashboard effortlessly.

Once your DID service is set up, inbound callers will be able to reach your teams with low friction. In a world where great customer service is a competitive advantage, direct-dial numbers are just another way to provide personalized experiences.

Adding the direct-dial features your team needs is simple when you go with an experienced VoIP provider, like , , , , , , and .

Twillio
Vonage
Wavix
Telnyx
QuestBlue
VoIP.ms
Voxtelesys
Private Branch Exchange
Public Switched Telephone Network
Voice over Internet Protocol