AltiGen MAXCS 7.0 Update 1 ACM Administration - Manual (Page 150)

Preferred Codec G.711 Mu-Law
First SIP Invite Request Content Codec Used for the Call
Supports G.711
The IP Codec table of Enterprise Manager is ignored. The
system uses codec G.711 to negotiate with the endpoint.
Does not support G.711 No codec is enforced.
Chapter 11: Board Configuration
134 MaxCS 7.5 Administration Manual
If the source extension is enabled for Fax-Over-IP (FoIP), then no codec is enforced.
Codec Preference - Outgoing Calls, IP Phones
Because IP Phone SIP call requests are always from MAXCS, the behavior is different from calls from third-
party phone extensions.
When a user makes an outgoing call from an IP phone, the system follows the IP Codec table in Enterprise
Manager. All IP phones support G.729 and G.711 Mu-Law.
When the Codec Preference feature is enabled, the system uses the following logic for handling outgoing SIP
trunk calls.
Preferred Codec Codec Used for the Call
G.729
The system modifies the IP phone's codec in the RE-INVTE SDP body with
G.729 codec. After the modification, MaxCS must pick G.729 and G.711
codecs as the preferred codecs to negotiate with the endpoint.
G.711 Mu-Law
The system modifies the IP phone's codec in the RE-INVTE SDP body with
G.711 codec. After the modification, MaxCS must pick G.711 and G.729
codecs as the preferred codecs to negotiate with the endpoint.
If the source extension is enabled for Fax-Over-IP (FoIP), then no codec is enforced.
Configuring the MAX1000/2000 Board
The MAX1000/2000 Server is a telecom appliance that consists of an embedded DSP board and two access
board slots. MAXCS treats the entire MAX system as one board with two access board options. The Boards
window displays the name of the MAX board, followed by [xxyy(-T1),xxyy]:
Figure 80. Boards View showing MAX board
xx refers to the number of analog trunks, and yy refers to the number of analog extensions. If an access board
has a T1/E1 port, -T1 is added to the end.
In the Boards window, double-click the MAX 1000/2000 board to open the main Board Configuration window.
The Channel Group Info panel shows the channel groups (groups of channels that belong to the same type).
For example, if one 4x4xT1 access board and one 4x8 access board are installed in the MAX 1000/2000 main
board, there will be three channel groups for the 4x4xT1 card, and two channel groups for the 4x8. When one
of the channel groups is selected, the Channel Mapping List reflects the selection.