Reference7:Administration/PBX/Objects/Trunk Line

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The Trunk Line object is typically used to register gateways to external lines. Several registrations are accepted. Calls sent to the trunk object are sent to the registrations in a round-robin manor. If the call to a registration fails in a way that indicates a local problem the next registration is tried.

Some general diversions can be configured for incoming calls e.g. for calls to invalid numbers.

Trunk Object specific configuration

Loopback Destination (Name or Number) to which calls are forwarded, which dialed the same Trunk object. This is typically used if the number of the Trunk object (e.g. 0) shall be used as extension number of the switchboard for incoming calls. If the Internal checkmark is set, this is executed also if the trunk is called from within the PBX with a calling party number matching the number of the trunk object. This can happen if for example an escape is configured for the node of the trunk object matching the number of the trunk object.
Incomplete Destination (Name or Number) to which calls are forwarded, which dialed an incomplete number. If the incoming call is enblock this can be determined immediatelly. For overlap receiving calls a timeout of 4s is used. Sometimes it is desired that calls without extension number are sent to the switchboard. In this case the number of the switchboard should be configured here.
Invalid Destination (Name or Number) to which calls are forwarded, which dialed an invalid number. Typically the number of the switchboard is configured here so that incoming calls whith an invalid extention are not lost. This is executed also for calls rejected because of the 'Reject ext. Calls' property at a called object.
Busy Destination (Name or Number) to which calls are forwarded, which dialed a busy number. If a CFB is configured at a called user this takes precedence. A CFB at at the called user to a number - turns this off for this user.
No Answer Destination (Name or Number) to which calls are forwarded, which dialed a destination which exists, but does not answer. There is no Timeout configurable for this anymore. The timeout value configured for CFNR is used instead. If a CFNR is configured at a called user this takes precedence. A CFNR at at the called user to a number - turns this off for this user.
Reroute supported This check box turn on rerouting of incoming calls which are diverted to the same Trunk object. Normally an incoming call which is diverted to the same Trunk object is sent out on the Trunk as normal outgoing call. If this option is checked a reroute request is sent out instead. If the call is received from an ISDN interface this is mapped to partial rerouting. By doing this no channel is used on the ISDN interface for such a call (instead of 2) and the original calling party number is sent to the final destination by the ISDN network. Rerouting is supported only for CFU and CFB, not for CFNR.
Set Calling = Diverting No Concerns calls that arrive on the PBX via the Trunk Line PBX object and are then forwarded by CFU, CFB or CFNR again to the Trunk Line object. For example: Subscriber A calls subscriber B. Subscriber B forwards the call from subscriber A to subscriber C.
The CGPN (Calling Party Number) remains unchanged for a call diversion. Merely the DGPN (Diverting Party Number) is also sent as information, so that both call numbers are visible at the diversion destination (subscriber C). For an external call diversion to the PSTN, it is not permitted to use an external CGPN (subscriber A), however. Therefore, the CGPN must be replaced by an associated call number, in this case the DGPN (subscriber B). If this check box is not enabled, the local telephone office, in such as case, will automatically replace the CGPN through "screening".
If you enable this check box, the diversion call is signalled as a normal outgoing call. The CGPN is then a number that belongs to the connection (subscriber B).
Outgoing Calls restricted If this checkmark is set all calls sent out on the Trunk object are sent with CLIR (Calling Line Identification Restricted).
Outgoing Calls CGPN If a number is configured here all calls sent out to the Trunk object are sent with this number as Calling extension. For example the number of the switchboard can be configured here so that callbacks are not sent to the original caller but to the switchboard.
Outgoing No Name If this checkmark is set no calling name nor calling name display information is sent with outgoing calls
Fake Connect on inc. Call If this checkmark is set an incoming call is connected (send out a fake connect message) as soon as inband info is available from the destination of the call even if the destination did not connect the call already. This is esspecially useful for call forward out to a public network, so that the caller can hear the real inband info from the public network. Also timeouts can be avoided in such a case for the incoming call if the call is forwarded to a destination with slow alert or connect (e.g. GSM).

Call Diversions

Call Diversions can be configured for the Trunk object due to the general nature of call diversion configuration, but there is no known useful application.

CFU

If configured a CFU is executed, so calls to the Trunk object are diverted.

CFB

If configured a CFB is executed, so calls thru the Trunk object to a busy destination are diverted.

CFNR

If configured a CFNR is executed, so calls thru the Trunk object are diverted if there is no answer.

Group Indications

The trunk object generates group indications for incoming and outgoing calls including a park position (a number from 0 to n), which is sort of a virtual channel number. Together with Park function keys on the phone this can be used to simulate an oldstyle key system, so that each phone can have Line keys (the Park function key) for each available line (the position). With these Line keys a line can be aquired, monitored, a call can be parked on the line and picked up from the line.