AudioCodes Mediapack mp-11x, Руководство пользователя

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Version 5.2 335 August 2007
SIP User's Manual 7. Telephony Capabilities
The PBX doesn't disconnect the call, but instead signals to the gateway that the call is
disconnected using one of the following methods:
„
Detection of polarity reversal / current disconnect:
The call is immediately disconnected after polarity reversal or current disconnect is
detected on the Tel side (assuming the PBX / CO produces this signal). This is the
recommended method.
Relevant parameters: EnableReversalPolarity, EnableCurrentDisconnect,
CurrentDisconnectDuration, CurrentDisconnectDefaultThreshold, and
TimeToSampleAnalogLineVoltage.
„
Detection of Reorder, Busy, Dial, and Special Information Tone (SIT) tones:
The call is immediately disconnected after a Reorder, Busy, Dial, or SIT tone is
detected on the Tel side (assuming the PBX / CO generates this tone). This method
requires the correct tone frequencies and cadence to be defined in the Call Progress
Tones file. If these frequencies are not known, define them in the CPT file (the tone
produced by the PBX / CO must be recorded and its frequencies analyzed -- refer to
Adding a Reorder Tone to the CPT File in the Reference Manual). This method is
slightly less reliable than the previous one. You can use the CPTWizard (described in
Call Progress Tones Wizard in the Reference Manual) to analyze Call Progress Tones
generated by any PBX or telephone network.
Relevant parameters: DisconnectOnBusyTone and DisconnectOnDialTone.
„
Detection of silence:
The call is disconnected after silence is detected on both call directions for a specific
(configurable) amount of time. The call isn’t disconnected immediately; therefore, this
method should only be used as a backup option.
Relevant parameters: EnableSilenceDisconnect and FarEndDisconnectSilencePeriod.
„
Special DTMF code:
A digit pattern that when received from the Tel side, indicates to the gateway to
disconnect the call.
Relevant
ini
file parameter: TelDisconnectCode.
„
Interruption of RTP stream:
Relevant parameters: BrokenConnectionEventTimeout and
DisconnectOnBrokenConnection.
Note:
This method operates correctly only if silence suppression is not used.
„
Protocol-based termination of the call from the IP side
Note:
The implemented disconnect method must be supported by the CO or PBX.