[cisco-voip] Fwd to another extension (or voice mail) when notregistered

Sat Sep 15 10:27:07 EDT 2007

Hope this might help...

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Cisco Unified CallManager 4.2 introduces the Call Forward Unregistered
(CFUR) feature as a way to reroute calls placed to a temporarily
unregistered destination phone. The configuration of CFUR consists of
two main elements:

*Destination selection

When the DN is unregistered, calls can be rerouted to either of the
following destinations:

-Voicemail

Calls can be sent to voicemail by selecting the voicemail checkbox and
configuring the CFUR calling search space to contain the partition of
the voicemail pilot number.

-A directory number used to reach the phone through the PSTN

This approach is preferred when a phone is located within a site whose
WAN link is down. If the site is equipped with Survivable Remote Site
Telephony, the phone (and its co-located PSTN gateway) will re-register
with the co-located SRST router. The phone is then able to receive calls
placed to its PSTN DID number.

In this case, the appropriate CFUR destination is the corresponding PSTN
DID number of the original destination DN. Configure this PSTN DID in
the destination field, along with applicable access codes and prefixes
(for example, 9 1 415 555 1234).

*Calling search space

Cisco Unified CallManager attempts to route the call to the configured
destination number by using the called DN's CFUR calling search space.
The CFUR calling search space is configured on the target phone and is
used by all devices calling the unregistered phone. This means that all
calling devices will use the same combination of route pattern, route
list, route group, and gateway to place the call, and that all CFUR
calls to a given unregistered device will be routed through the same
unique gateway regardless of where the calling phone is located. Cisco
recommends that you select a centralized gateway as the egress point to
the PSTN for CFUR calls and that you configure the CFUR calling search
space to route calls to the CFUR destination to this centralized
gateway.

The Call Forward Unregistered functionality can result in telephony
routing loops if a phone is unregistered while the gateway associated
with the phone's DID number is still under control of Cisco Unified
CallManager, as is the case if a phone is simply disconnected from the
network. In such a case, the initial call to the phone would prompt the
system to attempt a first CFUR call to the phone's DID through the PSTN.
The resulting incoming PSTN call would in turn trigger another CFUR
attempt to reach the same phone's DN, triggering yet another CFUR call
from the central PSTN gateway through the PSTN. This cycle could repeat
itself until system resources are exhausted.

The new service parameter

MaximumForwardUnRegisteredHopsToDn controls the maximum number of CFUR
calls that are allowed for a DN at the same time. The default value of 0
means the counter is disabled. If any DNs are configured to reroute CFUR
calls through the PSTN, loop prevention is required. Configuring this
service parameter to a value of 1 would stop CFUR attempts as soon as a
single call is placed through the CFUR mechanism. This setting would
also allow only one call to be forwarded to voicemail, if CFUR is so
configured. Configuring this service parameter to a value of 2 would
allow for up to two simultaneous callers to reach the voicemail of a DN
whose CFUR setting is configured for voicemail, while also limiting
potential loops to two for DNs whose CFUR configuration sends calls
through the PSTN.

Note Extension Mobility DNs should not be configured to send Call
Forward Unregistered calls to the PSTN DID associated with the DN. The
DNs of Extension Mobility profiles in the logged-out state are deemed to
be unregistered, therefore any calls to the PSTN DID number of a
logged-out DN would trigger a routing loop. To ensure that calls made to
Extension Mobility DNs in the logged-out state are sent to voicemail,
ensure that their corresponding Call Forward Unregistered parameters are
configured to send calls to voicemail. 

________________________________

From: Ahmed Elnagar [mailto:aelnagar at ACT-EG.COM] 
Sent: Saturday, September 15, 2007 8:21 AM
To: Rasim Duric
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Fwd to another extension (or voice mail) when
notregistered

is it available in any other versions?? any work around or so??

________________________________

From: Rasim Duric [mailto:rduric at uoguelph.ca]
Sent: Sat 15-Sep-07 4:12 PM
To: Ahmed Elnagar
Subject: RE: [cisco-voip] Fwd to another extension (or voice mail) when
notregistered

No, it is not available in CCM 4.1(3).

Rasim Duric

UoG

________________________________

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ahmed Elnagar
Sent: Saturday, September 15, 2007 8:10 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Fwd to another extension (or voice mail) when
notregistered

Hello all;

I am using CM 4.1(3) and I want to forward all voice calls to another
extension or to voice mail when the phone is not registered with
Callmanager, is it available?

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