TRBOnet SIP 2.0 support limitation
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- TRBOnet works as a 3rd party SIP application working with the SIP 2.0 protocol and can be connected to PBX as a SIP Extension or a SIP Trunk.
- TRBOnet is not a PBX server to which other services may be connected.
- Internal TRBOnet Telephony is for Demo purposes only and cannot be used as a replacement for a full featured PBX.
- The following requests from PBX are not supported:
| Request | Description | Notes |
|---|---|---|
| CANCEL | Cancel any pending request | Usually menas terminating a call while it is still ringing, before answer |
| UPDATE | Modify the state of a session without changing the state of the dialog |
|
| REFER | Ask recipient to issue a request for the purpose of call transfer |
|
| PRACK | Provision acknowledgement | PRACK is sent in response to provisional response (1xx) |
| SUBSCRIBE | Initiates a subscription for notification of events from a notifier |
|
| PUBLISH | Publish an even to a notification server |
|
| INFO | Send mid-session information that does not modify the session state | This method is often used for DTMF relay |