Today, my ITSP changed the server behavior. If I try to place a call the following happens:
to ITSP - INVITE sip:mynumber@itspdomain SIP/2.0
from ITSP - SIP/2.0 100 Trying
from ITSP - SIP/2.0 180 Ringing
from ITSP - SIP/2.0 200 OK
to ITSP - ACK sip:string@itsp SIP/2.0
to ITSP - INVITE sip:string@itsp SIP/2.0
from ITSP - SIP/2.0 606 Not Acceptable
to ITSP - ACK sip:string@itsp SIP/2.0
to ITSP - BYE sip:string@itsp SIP/2.0
from ITSP - SIP/2.0 200 OK
The result: I cannot place calls anymore. What happened and how to solve it?
Was it a direct media re-INVITE, a connected line update re-INVITE or a session timers re-INVITE. You need to provide enough information to enable one to decide between these cases, and for the first case, details of the changes in the SDP.
However, I think there is an issue where more than one codec is allowed, but both sides don’t support both codecs, where a bug can result in incompatible codecs on a direct media re-INVITE. If that is the problem, disabling directmedia (historically known as canreinvite) will avoid the problem, as will only allowing one codec.
