Cisco SPA525G Administration Guide - Page 125

Configuring Security, Quality, and Network Features Configuring Voice Codecs 6 Configuring Voice Codecs A codec resource is considered allocated if it has been included in the SDP codec list of an active call, even though it eventually might not be chosen for the connection. If the G.729a codec is enabled and included in the codec list, that resource is tied up until the end of the call whether or not the call actually uses G.729a. If the G729a resource is already allocated (and since only one G.729a resource is allowed per SPA), no other low-bit-rate codec can be allocated for subsequent calls. The only choices are G711a and G711u. Since two G.723.1/G.726 resources are available per SPA9X2, you should disable the use of G.729a to guarantee support for two simultaneous G.723/G.726 codecs. To configure the voice codecs on each extension: STEP 1 Log in to the web administration interface. STEP 2 Click Admin Login and advanced. STEP 3 Click the Ext tab for the extension you want to configure. STEP 4 Under Audio Configuration, configure the following parameters: Cisco SPA and Wireless IP Phone Administration Guide 123