I am writing a pjsip application and calling / answering works just fine. Now i want to implement that when i call someone i hear ringing, when i get a call its ringing.
I have searched for this but i only stumbled on answers who refer on the pjsua app in the example folders (pjproject-2.4.5/pjsip-apps/src/pjsua/) . So i tried to understand this program which contains multiple files (all in all about 3k lines of code) and special structs which just makes it harder to understand. So i could not figure out how to do this functionality and i would appreciate a hint to the right direction.
Another point would be a list of the codes i can give on answering an incoming call, since i could not find a one with descriptions what which code means.
appreciate your time.
SIP response codes are splitted in 6 classes
1xx: Provisional — request received, continuing to process the
request; Provisional responses, also known as informational
responses, indicate that the server contacted is performing some
further action and does not yet have a definitive response. A server
sends a 1xx response if it expects to take more than 200 ms to
obtain a final response. Note that 1xx responses are not transmitted
reliably. They never cause the client to send an ACK. Provisional
(1xx) responses MAY contain message bodies, including session
descriptions.
2xx: Success — the action was successfully received, understood, and
accepted;
3xx: Redirection — further action needs to be taken in order to
complete the request;
4xx: Client Error — the request contains bad syntax or cannot be
fulfilled at this server;
5xx: Server Error — the server failed to fulfill an apparently valid
request;
6xx: Global Failure — the request cannot be fulfilled at any server.
Here you can find PJSIP struct which holds these codes and SIP codes description