AltiGen comm ACM 5.1 - Manual (Page 245)

Chapter 16: Setting Up IP Extensions
AltiWare ACM 5.1 Administration Manual 231
For remote IP phone deployment
If you do not enter the remote IP phone's IP address into the IP Codec table, the system
will use the Default (Prefer G.723.1 support G.729) setting. You can change the Default
to Prefer G.729 support G.723.1, if desired.
To set up the VoIP codec and define IP address ranges, see “Setting VoIP Codec Profiles”
on page 327 and “Assigning Codec Profiles to IP Addresses” on page 330.