Disabling forwarding calls to each other

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rob.huffman Tue, 01/15/2008 - 16:06

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

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

Given this bug, if your users hop around a lot, you might just have them use Extension Mobility instead...

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