Cisco SPA509G Administration Guide - Page 315

Cisco SPA IP Phone Field Reference Ext Tab B Parameter Auth ID Mini Certificate SRTP Private Key Description Authentication ID for SIP authentication. Defaults to blank. Base64 encoded of Mini-Certificate concatenated with the 1024-bit public key of the CA signing the MC of all subscribers in the group. Defaults to blank. Base64 encoded of the 512-bit private key per subscriber for establishment of a secure call. Defaults to blank. Audio Configuration 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 G.729a 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 uses of the G.723/G.726 codecs. Parameter Preferred Codec 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, G722, G726-16, G726-24, G726-32, G726-40, G729a, or G723. NOTE Cisco SPA525G/525G2 choices are: G711u, G711a, G726-32, G729a, and G722. G.723 not available on SPA300 Series or SPA500 Series. G722 not available on WIP310. Defaults to G711u. Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 314