Cisco SPA1001 Administration Guide - Page 139

Chapter 5 Linksys ATA Field Reference PSTN Line Tab Audio Configuration (SPA3102/AG310) A codec resource is considered as allocated if it has been included in the SDP codec list of an active call, even though it eventually may not be the one chosen for the connection. So, 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 device, no other low-bit-rate codec may be allocated for subsequent calls; the only choices are G711a and G711u. On the other hand, two G.723.1/G.726 resources are available per device. Therefore it is important to disable the use of G.729a in order to guarantee the support of two simultaneous G.723/G.726 codec. Field Preferred Codec Silence Supp Enable Use Pref Codec Only Silence Threshold G729a Enable Echo Canc Enable G723 Enable Echo Canc Adapt Enable G726-16 Enable Echo Supp Enable G726-24 Enable Description Preferred codec for all calls. (The actual codec used in a call still depends on the outcome of the codec negotiation protocol.) Select one of the following: G711u, G711a, G726-16, G726-24, G726-32, G726-40, G729a, or G723. The default is G711u. To enable silence suppression so that silent audio frames are not transmitted, select yes. Otherwise, select no. The default is no. To use only the preferred codec for all calls, select yes. (The call fails if the far end does not support this codec.) Otherwise, select no. The default is no. Select the appropriate setting for the threshold: high, medium, or low. The default is medium. To enable the use of the G729a codec at 8 kbps, select yes. Otherwise, select no. The default is yes. To enable the use of the echo canceller, select yes. Otherwise, select no. The default is yes. To enable the use of the G723a codec at 6.3 kbps, select yes. Otherwise, select no. The default is yes. To enable the echo canceller to adapt, select yes. Otherwise, select no. The default is yes. To enable the use of the G726 codec at 16 kbps, select yes. Otherwise, select no. The default is yes. To enable the use of the echo suppressor, select yes. Otherwise, select no. The default is yes. To enable the use of the G726 codec at 24 kbps, select yes. Otherwise, select no. The default is yes. Document Version 3.2 Linksys IP Phone Administrator Guide 5-55