# Configuring SIP Trunks

**SIP trunking** is used for call setup, management, and teardown. It is flexible, reliable, and lightweight, allowing you to focus on your business rather than underlying telephony complexities.

SIP is the foundation of **Voice over IP (VoIP)** communications, and **SIP Trunking** enables VoIP connectivity through a PBX by connecting your system to external carriers and service providers.

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### Supported SIP Trunk Providers

PortSIP PBX supports a wide range of **mainstream SIP trunk providers worldwide**, including but not limited to:

* [Vonage](https://www.vonage.com/)
* [QuestBlue](https://questblue.com/)
* [VoIP.ms](https://voip.ms/)
* [Voxtelesys](https://voxtelesys.com/)
* [Bandwidth](https://www.bandwidth.com/)
* [Flowroute](https://flowroute.com/)
* [Skyetel](https://skyetel.com/)
* [Wavix](https://wavix.com/)
* [Twilio](https://www.twilio.com/en-us)
* [Telnyx](https://telnyx.com/)
* [Callcentric](https://www.callcentric.com/)
* [Telstra](https://www.telstra.com.au/)
* [Gamma](https://gammagroup.co/products/sip-trunking-call-management/)
* [VoIP Innovations](https://carrierservices.sangoma.com/)
* [Aire Networks](https://airenetworks.es/)
* [CM.com](https://www.cm.com/)
* [VoiceMeUp](https://www.voicemeup.com/)
* [SIPTRUNK](https://www.sipturnk.com)
* [SMSGlobal](https://www.smsglobal.com/)

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### SMS-Enabled SIP Trunk Providers

The PortSIP PBX has integrated the SMS feature as well with the following trunk providers:

* [Configuring Quest Blue SIP Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/questblue-sip-trunk)
* [Configuring Twilio SIP Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/twilio-sip-trunk)
* [Configuring Bandwidth SIP Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/bandwidth-sip-trunk)
* [Configuring Flowroute SIP Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/flowroute-sip-trunk)
* [Configuring Telnyx SIP Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/telnyx-sip-trunk)
* [Configuring Vonage SIP Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/vonage-sip-trunk)
* [Configuring VoIP.ms SIP Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/voip.ms-sip-trunk)
* [Configuring Voxtelesys SIP Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/voxtelesys-sip-trunk)
* [Configuring Wavix SIP Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/wavix-sip-trunk)
* [Configuring VoIP Innovation SIP Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/voip-innovations-sip-trunk)
* [Configuring Aire Networks Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/aire-networks-sip-trunk)
* [Configuring CM.com Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/cm.com-sip-trunk)
* [Configuring VoiceMeUp Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/voicemeup-sip-trunk)
* [Configuring SIPTRUNK Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/siptrunk-sip-trunk)
* [Configuring SMSGlobal Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/smsglobal-trunk)