TRBOnet operates as a third-party SIP client using the SIP 2.0 protocol. It can connect to a PBX as a SIP extension or a SIP trunk.
The Internal PBX server is intended for demo use only and is not a replacement for a full PBX.
Unsupported PBX Requests
| Request | Description | Notes |
|---|---|---|
| UPDATE | Modify the state of a session without changing the dialog state | |
| REFER | Request the recipient to issue a call-transfer related request | |
| PRACK | Provisional acknowledgment | Sent in response to 1xx provisional responses |
| SUBSCRIBE | Start an event-notification subscription | |
| PUBLISH | Publish an event to a notification server | |
| INFO | Send mid-session information without changing session state | Often used for DTMF relay |