Disabling forwarding calls to each other

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Rob Huffman Tue, 01/15/2008 - 16:06
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Hi Julio,


This issue has not yet been fixed, this is a known bug (feature request). For the time being you will have to educate your users to be careful when forwarding;


CSCds43736 Bug Details



Headline Feature Req: Call Fwd loops should be handled gracefully by CM


Product ciscocm


First Found-in Version 3.0(3a)


Status Assigned


Feature request:


When two or more phones are forwarded to create a forward loop CM will

tear down the call when it reaches the ForwardMaximumHopCount.


The CM should handle this as follows:

PhoneA fwd Phone B

PhoneB fwd Phone C

PhoneC fwd Phone A


When you call Phone A from Phone X the Call Manager will ignore the loop and

Phone C will ring.


Following the same principle when Phone B is called, the call should go to

Phone A as it is the last hop before the loop.


From this good doc;


Cisco CallManager Issues with Call Forward All


http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a00801b3f4b.shtml#t5


Hope this helps! Sorry man.

Rob


Rob Huffman Tue, 01/15/2008 - 18:26
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Hi Julio,


You are most welcome :) There are some tips for mitigating this issue in this good doc;


Cisco CallManager Loop Avoidance Guide to Best Practices


http://www.cisco.com/en/US/netsol/ns340/ns394/ns165/ns391/networking_solutions_design_guidance09186a00801f8e28.html#wp41158



And there is hope on the horizon in CCM 6.x, although I understand there are still a few wrinkles to work out;


Call Forward All Loop Prevention Message Changes


Changes for the following error messages that display on the phones for Call Forward All (CFA) loop prevention occurred:


•When a user activates CFA from a phone, resulting in a CFA loop:


-Original error message: "Call Forward Loop"


-New error message: "CFwdAll Loop Detected"


Release Notes for Cisco Unified Communications Manager Release 6.0(1)


http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/rel_notes/6_0_1/601cmrn.html#wp80207


Hope this helps!

Rob

Aaron Dhiman Wed, 01/16/2008 - 10:13
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Given this bug, if your users hop around a lot, you might just have them use Extension Mobility instead...

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