Linksys SPA2102-AN Administration Guide - Page 187
Disconnect Tone, Detect VoIP Long Silence is yes.
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ATA Voice Field Reference Line page B Detect VoIP Long Silence If enabled, SPA will disconnect both call legs when the VoIP side has no voice activity for a duration longer than the length specified in the VoIP Long Silence Duration parameter during a gateway call. The default is no. PSTN Long Silence This value is minimum length of PSTN silence (or inactivity) Duration in seconds to trigger a gateway call disconnection if Detect PSTN Long Silence is yes. VoIP Long Silence Duration The default is 30. This value is minimum length of VoIP silence (or inactivity) in seconds to trigger a gateway call disconnection if Detect VoIP Long Silence is yes. PSTN Silence Threshold The default is 30. This parameter adjusts the sensitivity of PSTN silence detection. Choose from {very low, low, medium, high, very high}. The higher the setting, the easier to detect silence and hence easier to trigger a disconnection. Min CPC Duration Detect Disconnect Tone The default is medium. Specify the minimum duration of a low tip-and-ring voltage (below 1V) for the Gateway to recognize it as a CPC signal or PSTN line removal. The default is 0.2. If enabled, SPA will disconnect both call legs when it detects the disconnect tone from the PSTN side during a gateway call. Disconnect tone is specified in the Disconnect Tone parameter, which depends on the region of the PSTN service. The default is yes. Cisco Small Business ATA Administration Guide 187