The codec information used for a call must be available to the resource manager in order to calculate the required bandwidth.

In the case of HFA terminals, the setting in the AMO must match the setting in the terminal (configuration). In our example, the HFA subscribers have been configured via DLS or the local WBM such that the HFA devices in the host prefer G.711 and the HFA subscribers behind the WAN route force G.729A.

The sample size of the IP phones impacts the required bandwidth. A sample size of 20ms is assumed here both for G.711 and G.729 A. These values can be changed on the terminal (or via DLS).

CHANGE-SBCSU:STNO=2420&2421,OPT=OPTI,IPCODEC=G711P;
CHANGE-SBCSU:STNO=2422&2423,OPT=OPTI,IPCODEC=G729A;
CHANGE-SBCSU:STNO=2424&2425,OPT=OPTI,IPCODEC=G711P;