AltiGen MAXCS 7.5 New Features Guide - Manual (Page 14)

MaxCS 7.5 New Features Guide Page 14 of 22
Codec Preference – Incoming Calls
When the Codec Preference feature is enabled, the system uses the following logic for handling incoming calls,
based upon the content of the first SIP INVITE request.
Preferred Codec is G.729
First SIP INVITE Request Content Codec Used for Call
SIP Trunk supports G.729
The IP Codec table of Enterprise Manager is ignored. The system uses
codec G.729 to negotiate with the endpoint.
SIP Trunk does not support G.729 No codec is enforced.
Preferred Codec is G.711 Mu-Law
First SIP INVITE Request Content Codec Used for Call
SIP Trunk supports G.711 Mu-Law
The IP Codec table of Enterprise Manager is ignored. The system uses
codec G.711 Mu-Law to negotiate with the endpoint.
SIP Trunk does not support G.711
Mu-Law
No codec is enforced.
If the target extension or DNIS number is enabled for Fax-Over-IP (FoIP), then no codec is enforced.
Codec Preference – Outgoing Calls, Third-Party IP Phones
When the Codec Preference feature is enabled, the system uses the following logic for handling outgoing SIP trunk
calls from third-party IP phones. (Calls are considered SIP trunk calls if the target has a SIP trunk access code or an
outcall routing access code prefix.)
Preferred Codec is G.729
First SIP INVITE Request Codec Used for Call
Supports G.729
The IP Codec table of Enterprise Manager is ignored. The system uses
codec G.729 to negotiate with the endpoint.
Does not support G.729 No codec is enforced.