[cisco-voip] changing behaviour of un-registered phone

[Lelio Fulgenzi]

sweet. exactly what i was looking for. thanks. 

Scott, whacha doing this weekend? i need help upgrading. ;)

  ----- Original Message ----- 
  From: Ted Nugent 
  To: Lelio Fulgenzi ; cisco-voip at puck.nether.net 
  Sent: Friday, January 26, 2007 11:30 PM
  Subject: Re: [cisco-voip] changing behaviour of un-registered phone


  CFUR in SRND 4.2
  http://www.cisco.com/univercd/cc/td/doc/product/voice/c_callmg/4_2/srnd4_2/uc4_2/42dialpl.htm


  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. 
  --- Lelio Fulgenzi <lelio at uoguelph.ca> wrote:

  > I recall a while back there was some changes to the
  > behaviour of an unregistered phone. The default I
  > believe is to send it to the CFNA configured of the
  > phone. I'd like to be able to route a number of
  > phones if they are not registered but I want to read
  > more about it to see what the caveats are.
  > 
  > 
  >
  --------------------------------------------------------------------------------
  > Lelio Fulgenzi, B.A.     Network Analyst (CCS)
  > University of Guelph     Guelph, Ontario     N1G 2W1
  > (519) 824-4120 x56354     (519) 767-1060 FAX 
  >
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