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Configuration Guide
A100K10333 v.5.5
AudioCodes-114/118
4
FAR END DISCONNECT (FED)
Far End Disconnect refers to methods for detecting that a remote party
has hung up. The far end disconnect signal is not mandatory and this
could create problems. If the Far End Disconnect signal is not sent to or
properly detected by the SIP Gateway, the connection will not be
released by the unit, thus freezing the FXO line in the off hook state.
4.1 Call Termination options in the SIP Gateway
The following methods for call termination are supported by the
AudioCodes MP-114/118. Note that the used disconnection methods
must be supported by the CO (Central Office) or to PBX (Private Branch
Exchange).
z
Detection of polarity reversal / current disconnect
z
Detection of Busy / Dial tones
z
Detection of silence
z
Timeout of Conversation
4.1.1 Detection of polarity reversal / current disconnect
This is the recommended method. The call is immediately disconnected
after polarity reversal or current disconnect is detected on the Tel side
(assuming the PBX / CO produces this signal).
;
Display the Navigation Tree in
Full
View. Enable the relevant
detection method in
Configuration
tab >
Protocol Configuration
menu >
SIP Advanced Parameters
submenu >
Advanced
Parameters
page item.
4.1.2 Detection of Busy / Dial tones
The call is immediately disconnected after Busy or Dial tone is detected
on the Tel side (assuming the PBX / CO produces this tone). This
method requires the correct tone frequencies and cadence to be defined
in the Call Progress Tones (CPT) file of the SIP Gateway. 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). This method is slightly less reliable than the previous one.
;
Open the ‘FXO Settings’ page item in
Configuration
tab >
Advanced Applications
menu >
FXO Settings
page item and
enable the relevant detection method.
Call Progress Tones (CPT)
The Detection of Busy / Dial tones method requires the correct tone
frequencies and cadence (on/off sequence) to be defined in the Call
Progress Tones (CPT) file of the SIP gateway. These tones are region
specific and telephone exchange dependent.
The Call Progress Tones (CPT) configuration file is a binary file (with the
extension .
dat
).
