Going Real-Time with PortSIP PBX Pub/Sub

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PortSIP PBX provides the Pub/Sub mechanism which is based on the WebSocket(PortSIP WSI). The user is able to create the WebSocket in any programming language to subscribe to the PBX events, once the subscribed events occur, PortSIP PBX will push the event message to the subscriber automatically, the message is in the JSON format.
Sevice
The PortSIP PBX/UCaaS provides WSI on port 8885, the server must be allowed this port on the firewall for TCP, which requires SSL.
Topics and keys
PortSIP PBX provides below topics and keys for the Pub/Sub.
extension_events
All extension-related event messages will be published by extension_events . Below, are the various message keys.
extension_register: extension registered to the PBX or un-register from the PBX.
For example, the extension 102 registered to PBX, the subscriber will receive the below message:
{
    "event_type":"extension_register",
    "extension":"sip:[email protected]",
    "extension_id":"494521070842286080",
    "registration_contacts":[
        {
            "contact_uri":"<sip:[email protected]:10061>;+sip.instance=\"<urn:uuid:F36DDB5A-5CC3-A59A-0FB2-E53F7A56F245>\"",
            "expires":1632668422,
            "instance":"<urn:uuid:F36DDB5A-5CC3-A59A-0FB2-E53F7A56F245>",
            "last_update":1632668122,
            "public_address":"113.246.194.98:10061",
            "received_from":"113.246.194.98:10061",
            "reg_id":0,
            "user_agent":"Test SIPMaster for IOS"
        },
        {
            "contact_uri":"<sip:[email protected]:10243>;+sip.instance=\"<urn:uuid:8D5941A6-EB96-4E7A-9EB7-DA940E56513C>\"",
            "expires":1632668476,
            "instance":"<urn:uuid:8D5941A6-EB96-4E7A-9EB7-DA940E56513C>",
            "last_update":1632668176,
            "public_address":"113.246.194.98:10243",
            "received_from":"113.246.194.98:10243",
            "reg_id":0,
            "user_agent":"PortSIP UC Client iOS - v16.0.001"
        }
    ],
    "tenant_id":"236047118140313600",
    "tenant_name":"admin",
    "time":"1632668176"
}
The extension is indicates which extension occurs the register event, the extension_id is  the id of that extension.  The arrayregistration_contacts  is includes the current registrations information. In this example, there have two SIP client devices/apps are registered to PBX, their agents are: Test SIPMaster for IOS and PortSIP UC Client iOS - v16.0.001, if both of these clients are unregistered from PBX, the array "registration_contacts"  will not presents, see below example:
{
    "event_type":"extension_register",
    "extension":"sip:[email protected]",
    "extension_id":"494521070842286080",
    "removed_contacts":[
        {
            "contact_uri":"<sip:[email protected]:10243>;expires=0;+sip.instance=\"<urn:uuid:8D5941A6-EB96-4E7A-9EB7-DA940E56513C>\"",
            "expires":1632668724,
            "instance":"<urn:uuid:8D5941A6-EB96-4E7A-9EB7-DA940E56513C>",
            "last_update":1632668724,
            "public_address":"113.246.194.98:10243",
            "received_from":"113.246.194.98:10243",
            "reg_id":0,
            "user_agent":"PortSIP UC Client iOS - v16.0.001"
        }
    ],
    "tenant_id":"236047118140313600",
    "tenant_name":"admin",
    "time":"1632668724"
}
In the above message, the arrayregistration_contacts is no longer present, but have an array isremoved_contacts  indicates which client app/device is unregistered from PBX, in case, the client AppPortSIP UC Client iOS - v16.0.001  is unregistered from PBX, now there are no any registrations on the PBX so the extension 102 is offline.
call_hold: call was held.
Once an established call is held by the caller or callee, the call_hold event will occur, see below example: 
{
    "aor":"sip:[email protected]",
    "call_id":"09jV-7QM2B-3E0Q-m20exw..",
    "event_type":"call_hold",
    "peer_aor":"sip:[email protected]",
    "session_id":"494527456623988736",
    "tenant_id":"236047118140313600",
    "tenant_name":"admin",
    "time":"1632669389"
}
In the above example, the call is hold by extension 102, and another party of the call is extension 103.
call_unhold: call has been resumed from hold.
Once a call is resumed from the held state, the call_unhold event occurs. 
{
    "aor":"sip:[email protected]",
    "call_id":"09jV-7QM2B-3E0Q-m20exw..",
    "event_type":"call_unhold",
    "peer_aor":"sip:[email protected]",
    "session_id":"494527456623988736",
    "tenant_id":"236047118140313600",
    "tenant_name":"admin",
    "time":"1632669492"
}
In the above example, the call is un-hold by extension 102, and another party of the call is extension 103.
call_start: call starting.
When the caller starting to make a call to the callee, this event will occurs.
{
    "call_id":"rjFyDxQSbXPxXAd1IR8W-g..",
    "callee":"sip:[email protected]",
    "caller":"sip:[email protected]",
    "caller_display_name":"",
    "cdr_id":"494533487185891328",
    "direction":"ext",
    "event_type":"call_start",
    "request_id":"0",
    "session_id":"494533487177502720",
    "tenant_id":"236047118140313600",
    "tenant_name":"admin",
    "time":"1632670771"
}
In the above example, extension 102 is make the call to callee 103,  the  direciton is ext means the call is between extensions. the session_id is a unique ID of this call, after call is completed, we can use this session_id to query the recording file by REST API.
call_established: the call was answered and successfully connected.
{
    "call_id":"K3jV2vbPzplkrC3cIBTGPg..",
    "call_target":"sip:[email protected]",
    "callee":"sip:[email protected]",
    "caller":"sip:[email protected]",
    "event_type":"call_established",
    "session_id":"494535522404798464",
    "tenant_id":"236047118140313600",
    "tenant_name":"admin",
    "time":"1632671262"
}
In the above example, the call is answered by the callee extension 103.
call_ended: call has ended.
{
    "call_id":"K3jV2vbPzplkrC3cIBTGPg..",
    "call_target":"",
    "callee":"sip:[email protected]",
    "caller":"sip:[email protected]",
    "event_type":"call_ended",
    "session_id":"494535522404798464",
    "tenant_id":"236047118140313600",
    "tenant_name":"admin",
    "time":"1632671272"
}
In the above example, the call is ended.
call_noanswer: call is a no answer in the specified time(seconds) then hang up due to timeout.
{
    "call_id":"mbZA5vcQHZOkrPZfHjtsdQ..",
    "call_target":"",
    "callee":"sip:[email protected]",
    "caller":"sip:[email protected]",
    "event_type":"call_noanswer",
    "session_id":"494536565997965312",
    "tenant_id":"236047118140313600",
    "tenant_name":"admin",
    "time":"1632671510"
}
call_reroute: the call was re-routed to another target.
call_fail: call has failed.
{
    "call_id":"9SyfcKeZvuIVipZmefINbw..",
    "call_target":"",
    "callee":"sip:[email protected]",
    "caller":"sip:[email protected]",
    "event_type":"call_fail",
    "fail_code":480,
    "session_id":"494537752386211840",
    "tenant_id":"236047118140313600",
    "tenant_name":"admin",
    "time":"1632671788"
}
In the above example, the 102 make a call to 103, but the 103 is offline, so the call is failed, and the fail_codeis 480 which is the same as the status code of the SIP standards.
target_add: start a call to a target. For example, extension 101 is registered to PBX from an IP Phone or an App, when someone makes calls to 101, the IP Phone, or App will be added as the target. (The target_add event will be triggered two times.)
target_ringing: the called target is ringing.
target_noanswer: there is no answer from the called target.
target_fail: call failed from the called target. For example, the App / IP Phone rejected the call.
target_ended: call has ended from the called target. For example, the App / IP Phone hangs up the call.
cdr_events
Once a call has ended, the CDR of this call will be pushed to the subscribers, the message topic is: cdr_events, the message key is below.
call_cdr: once a call has ended, the CDR will be packed in JSON format and pushed to the subscriber.
queue_events
Once the queue status is changed, for example, the caller who is in the queue has hung up the call, or the caller who is in the queue is answered by an agent, the related status information will be pushed to the subscribers. The message topic is queue_events. The below is the message keys.
queue_status: if the queue status changed, the information will be packed into a JSON message and pushed to the subscriber.
queue_member_state: if the agent of the queue state is set to ready or not-ready, this message will be pushed.
trunk_events
Once a trunk state is changed, for example, the PBX successfully registered to a Trunk, or register to the Trunk fails, or the registration is lost from a trunk, or a connection timeout, PortSIP PBX will push the message information to the subscribers, the message topic is trunk_events, the keys are below.
trunk_connected: PBX is successfully connected to a trunk.
trunk_disconnected: PBX is successfully connected to a trunk.
​
Subscribe and unsubscribe
In order to subscribe to the events, a user needs to establish a session by opening a WebSocket connection to the listening port (8885) of the PortSIP PBX with authentication credentials. This requires a previously established user account on the PortSIP PBX. The user account can be an extension or a tenant.
You can use the below JSON message to do the authorization:
{
"command":"auth",
"extension":"101",
"domain":"test.com",
"password":"111111"
}
The domain is the SIP domain of the extension, the password is the web password of extension.
If the tenant wishes to subscribe to the events, authorization is required as below:
{
"command" : "auth",
"name": "tenant name",
"password": "111111"
}
If there is no error, the response is as below:
{"status":0}
Otherwise the response including errors as below:
{"error":"name or password error","status":-1}
After successfully being authenticated, the user can now subscribe to the events.
For instance, the extension 101 wishes to subscribe to extension 102, 103 events(the 101, 102, 103 must in the same extension group), just send the below command to subscribe.
​
{
"command":"subscribe",
"topics":[
 { 
 "topic" : "extension_events",
 "keys": ["extension_register", "call_start", "call_fail", "call_reroute", "call_noanswer", "call_hold", "call_unhold", "call_ended", "call_established", "target_add", "target_fail", "target_noanswer", "target_ringing", "target_ended"] 
 } 
],
"extensions":[
"102",
"103"] 
}
If we want to subscribe to both extension events and CDR events, use the below command.
{
"command":"subscribe",
"topics":[
 { 
 "topic" : "extension_events",
 "keys":["extension_register", "call_start", "call_fail", "call_reroute", "call_noanswer", "call_hold", "call_unhold", "call_ended", "call_established", "target_add", "target_fail", "target_noanswer", "target_ringing", "target_ended"] 
},
 { 
 "topic" : "cdr_events",
 "keys":["call_cdr"] 
 } 
],
"extensions":[
"102",
"103"]  
}
If we want to unsubscribe from the events, use the below command.
{
"command":"unsubscribe",
"topics":[
 { 
 "topic" : "extension_events",
 "keys":["extension_register", "call_start", "call_fail", "call_reroute", "call_noanswer", "call_hold", "call_unhold", "call_ended", "call_established", "target_add", "target_fail", "target_noanswer", "target_ringing", "target_ended"] 
},
 { 
 "topic" : "cdr_events",
 "keys":["call_cdr"] 
 } 
],
"extensions":[
"102",
"103"]  
}
If we just want to unsubscribe from the CDR events, use the below command.
{
"command":"unsubscribe",
"topics":[
 { 
 "topic" : "cdr_events",
 "keys":["call_cdr"] 
 } 
] 
}
If we want to subscribe to the queue status, use the below command.
Note, the extension only have permission to subscribe to the queues belonging to that extension, if the extension(subscriber) is not a member of the queue, and also not a queue manager of the queue, the events will not push to the extension(subscriber). For example, if extension 101 is the member/agent/queue manager of queue 8001 and 8002, after 101 is subscribed to queue events, both 8001 and 8002 queue status will be pushed to extension 101.
The tenant has permission to subscribe to any queues.
{
"command":"subscribe",
"topics":[
 { 
 "topic" : "queue_events",
 "keys":["queue_status"] 
 } 
],
"queues":[
"8001",
"8002"]  
}
If we want to subscribe to the trunk events, use the below commands.
Note: only the tenant has the permissions to subscribe to the trunk events.
{
"command":"subscribe",
"topics":[
 { 
 "topic" : "trunk_events",
 "keys":["trunk_connected", "trunk_disconnected"] 
 } 
] 
}
After successfully being subscribed to the trunk events, once a trunk is connected or disconnected, the PBX will push information to the subscriber.
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