I am working on a SIP client. I'm monitoring with Wireshark the SIP packets.
Register with the SIP server works fine.
When making a call, I have this:
Client - INVITE message
Server - 401 UNAUTHORIZED
Client - INVITE message
Server - 403 Forbidden
I do not have access to the server. What could go wrong? Why can't I make a call?
What is with that 401 and then 403 if registering worked ok?
That is noramal. Server ask for authorization(401). After that it say authorization incorrect.
That is normal behavour for any of this:
1) You use incorrect secret for this username
2) You use domain name/realm which is incorrect and domain name/realm is set on server.
If registration work ok, can be
1) Server work with registration different way - contact server support
2) You dialling in incorrect format or this number not allowed to call with your extension.