Cisco SPA2102-SF Administration Guide - Page 177

ATA Voice Field Reference Line page B FAX Codec Symmetric DTMF Process AVT FAX Passthru Method DTMF Tx Method DTMF Tx Mode DTMF Tx Strict Hold Off Time: To force the ATA to use a symmetric codec during fax passthrough, select yes. Otherwise, select no. The default is yes. To use the DTMF process AVT feature, select yes. Otherwise, select no. This field is not available for the PAP2T. The default is yes. Select the fax passthrough method: None, NSE, or ReINVITE. The default is NSE. Select the method to transmit DTMF signals to the far end: InBand, AVT, INFO, Auto, InBand+INFO, or AVT+INFO. InBand sends DTMF using the audio path. AVT sends DTMF as eypents. INFO uses the SIP INFO method. Auto uses InBand or AVT based on the outcome of codec negotiation. The default is Auto. DTMF Detection Tx Mode is available for SIP information and AVT . Options are: Strict or Normal. The default is Strict for which the following are true: • A DTMF digit requires an extra hold time after detection. • The DTMF level threshold is raised to -20 dBm. • The minimum and maximum duration thresholds are: • strict mode for AVT: 70 ms • normal mode for AVT: 40 ms • strict mode for SIP info: 90 ms • normal mode for SIP info: 50 ms This parameter is in effect only when "DTMF Tx Mode" is set to "strict," and when"DTMF Tx Method" is set to out-ofband; i.e. either AVT or SIP-INFO. The value can be set as low as 40 ms. There is no maximum limit. A larger value will reduce the chance of talk-off (beeping) during conversation, at the expense of reduced performance of DTMF detection, which is needed for interactive voice response systems (IVR). Default: 90 ms Cisco Small Business ATA Administration Guide 177