System information

selecting only one code.
If set, than only one codec will be left in the sdp (plus the dtmf codecs). This will help, when the server answer to invitation with more than one codec in the 200.
The client should answer with the final codec in the ACK, but many endpoint fail to do so.
SessionTimer: use session keep alive.
-0: don’t use
-1: load from global config
-2: autodetect (and using the sesskeepalive interval from the global configuration)
-Other: use with the specified timeout (minutes)
For example if we set it to 5, than a UPDATE or reINVITE will be sent in every 5 minute to the other party. Please note
, that the session keepalive is not the same with N
keepalive (wich is used with every endpoint automatically)