Cisco SPA2102-SF Administration Guide - Page 206

ATA Voice Field Reference PSTN Line page (SPA3102) B Use Auth ID Auth ID Call Capacity To use the authentication ID and password for SIP authentication, select yes. Otherwise, select no to use the user ID and password. The default is no. Authentication ID for SIP authentication. Maximum number of calls allowed on this line interface. Choices: {unlimited,1,2,3,...25 }. Default is 16. Note that the ATA device does not distinguish between incoming and outgoing calls when talking about call capacity. NOTE: unlimited = 16 Voice tab > PSTN Line page (SPA3102) > Audio Configuration section 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. Preferred Codec Silence Supp Enable 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. Cisco Small Business ATA Administration Guide 206