AudioCodes Media Pack MP-124, User Manual

Page: 281 / 584

Version 6.6 281 MP-11x & MP-124
User's Manual 25. Analog Gateway
25.14.3.2 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.
25.14.3.3 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).
25.15 Remote PBX Extension between FXO and FXS
Devices
Remote PBX extension offers a company the capability of extending the "power" of its local
PBX by allowing remote phones (remote offices) to connect to the company's PBX over the
IP network (instead of via PSTN). This is as if the remote office is located in the head office
(where the PBX is installed). PBX extensions are connected through FXO ports to the IP
network, instead of being connected to individual telephone stations. At the remote office,
FXS units connect analog phones to the same IP network. To produce full transparency,
each FXO port is mapped to an FXS port (i.e., one-to-one mapping). This allows individual
extensions to be extended to remote locations. To call a remote office worker, a PBX user
or a PSTN caller simply dials the PBX extension that is mapped to the remote FXS port.
This section provides an example on how to implement a remote telephone extension
through the IP network, using 8-port FXO and 8-port FXS interfaces. In this configuration,
the FXO device routes calls received from the PBX to the ‘Remote PBX Extension’
connected to the FXS device. The routing is transparent as if the telephone connected to
the FXS device is directly connected to the PBX.