Cisco SPA2102-SF Administration Guide - Page 209

ATA Voice Field Reference PSTN Line page (SPA3102) B Hook Flash Tx Method Select the method for signaling hook flash events: None, AVT, or INFO. None does not signal hook flash events. AVT uses RFC2833 AVT (event = 16). INFO uses SIP INFO with the single line signal=hf in the message body. The MIME type for this message body is taken from the Hook Flash MIME Type setting. FAX Disable ECAN The default is None. If enabled, this feature automatically disables the echo canceller when a fax tone is detected. To use this feature, select yes. Otherwise, select no. Release Unused Codec The default is no. This feature allows the release of codecs not used after codec negotiation on the first call, so that other codecs can be used for the second line. To use this feature, select yes. Otherwise, select no. FAX Enable T38 The default is yes. To enable the use of the ITU-T T.38 standard for faxing, select yes. Otherwise, select no. FAX Tone Detect Mode The default is yes. This parameter has three possible values: caller or callee - SPA will detect FAX tone whether it is callee or caller caller only - SPA will detect FAX tone only if it is the caller callee only - SPA will detect FAX tone only if it is the callee Symmetric RTP The default is caller or callee. (SPA3102 and SPA8800 only) Enable symmetric RTP operation. If enabled, the ATA sends RTP packets to the source address and port of the last received valid inbound RTP packet. If disabled (or before the first RTP packet arrives) the ATA sends RTP to the destination as indicated in the inbound SDP. The default is yes. Cisco Small Business ATA Administration Guide 209