Version 5.8
507
October 2009
SIP User's Manual
9. IP Telephony Capabilities
Protocol-based termination of the call from the IP side
Note:
The implemented disconnect method must be supported by the CO or PBX.
9.7.3.2 Call Termination before Call Establishment
The device supports the following call termination methods before a call is established:
Call termination upon receipt of SIP error response (in Automatic Dialing mode):
By default, when the FXO device operates in Automatic Dialing mode, there is no
method to inform the PBX if a Tel-to-IP call has failed (SIP error response - 4xx, 5xx or
6xx - is received). The reason is that the FXO device does not seize the line until a SIP
200 OK response is received. Use the FXOAutoDialPlayBusyTone parameter to
allow the device to play a Busy/Reorder tone to the PSTN line if a SIP error response
is received. The FXO device seizes the line (off-hook) for the duration defined by the
TimeForReorderTone parameter. After playing the tone, the line is released (on-hook).
Call termination after caller (PBX) on-hooks phone (Ring Detection Timeout
feature):
This method operates in one of the following manners:
•
Automatic Dialing is enabled:
if the remote IP party doesn't answer the call and
the ringing signal (from the PBX) stops for a user-defined time (configured by the
parameter FXOBetweenRingTime), the FXO device releases the IP call.
•
No automatic dialing and Caller ID is enabled:
the device seizes the line after
detection of the second ring signal (allowing detection of caller ID sent between
the first and the second rings). If the second ring signal is not received within this
timeout, the device doesn't initiate a call to IP.
9.7.3.3 Ring Detection Timeout
The operation of Ring Detection Timeout depends on the following:
Automatic dialing is disabled and Caller ID is enabled:
if the second ring signal is
not received for a user-defined time (using the parameter FXOBetweenRingTime), the
FXO device doesn’t initiate a call to the IP.
Automatic dialing is enabled:
if the remote party doesn't answer the call and the
ringing signal stops for a user-defined time (using the parameter
FXOBetweenRingTime), the FXO device releases the IP call.
Ring Detection Timeout supports full ring cycle of ring on and ring off (from ring start to ring
start).
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