Linksys SPA921 Cisco SPA9000 Voice System Administration Guide - Page 252

SPA9000 Field Reference Voice tab B DTMF Detection Mode FAX Process NSE Hook Flash Tx Method FAX Disable ECAN Release Unused Codec FAX Enable T38 FAX Tone Detect Mode FAX T38 Redundancy Determines where to use Normal or Strict DTMF detection Strict mode reduces the likelihood of false DTMF detection but requires an extra hold time after detection. Also the DTMF level is raised. Under strict mode, the minimum duration threshold is 60 and 90 ms for AVT and SIP-INFO respectively. The level threshold is -20 dBm. Default: Strict To use the fax process NSE feature, select yes. Otherwise, select no. Default: yes 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. Default: 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. Default: 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. Default: yes To enable the use of the ITU-T T.38 standard for faxing, select yes. Otherwise, select no. Default: 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 Default: caller or callee The redundancy factor for the T.38 Fax Relay from 0 (none) to 4 Default: 1 SPA9000 Voice System Administration Guide 250