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CUCM 9.1.1a CFA override by CFNA

Hello,

we upgraded a Cluster from 6.1.4 to 9.1.1a.

Now I have got a strange behavior using call forward.

Situation A

Phone A CFA to phone B

Phone B CFNA to phone A

Someone calls phone A or B:

Phone B rings; CFNA timeout occurs -> Phone A rings (CFA is overridden)

Situation B

Phone A CFA to phone B

Phone B CFB to phone A

Phone B is busy; someone calls phone A or B:

Phone A rings (CFA is overridden)

CFA = call forward all

CFNA = call forward no answer

CFB = call forward busy

Especially Situation A seems strage to me.

Does anybody know a workaround for this? Maybe the "CFA Destination Override" Service Parameter?

Thanks,

Bernhard

  • IP Telephony
1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

CUCM 9.1.1a CFA override by CFNA

Seems to me that in both cases the system is breaking a call routing loop as soon it is detected (call forwarded to where it comes from).. I consider that proper behavoir, for sure some may not agree.

6 REPLIES
Super Bronze

CUCM 9.1.1a CFA override by CFNA

Hi

That behaviour would match the behaviour I would expect if 'CFA Destination Override' was set to 'Enabled'. Is this the case on your system?

CFB would always 'override' CFNA - if the phone is busy then it cannot time out.

Regards

Aaron

Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate!

CUCM 9.1.1a CFA override by CFNA

I have tested with "CFA Destination Override" Service Parameter Disabled and Enabled.

This doesn't change anything.

Maybe you got me wrong?

CFB and CFNA override the CFA!

Hall of Fame Super Gold

CUCM 9.1.1a CFA override by CFNA

Seems to me that in both cases the system is breaking a call routing loop as soon it is detected (call forwarded to where it comes from).. I consider that proper behavoir, for sure some may not agree.

Hall of Fame Super Red

CUCM 9.1.1a CFA override by CFNA

Hi Bernhard,

I'll just add this note to the good tips from my friends Aaron & Paolo (+5 each)

It sounds like you may be hitting this bug that first appeared in

CUCM 9.1.1;

Manage an application caused CFA loop via "Forward Maximum Hop Count"

CSCug04494

Description

Symptom:Call Forward All gets ignored by CUCM

Conditions:CUCM  ignores the CFA request when it recognizes a loop. This loop is  intentional and should not be broken by CUCM on certain occasions.

Workaround:None.
Known Affected Releases:

(1)

9.1(1.10000.1)


Known Fixed Releases:

(0)



Cheers!

Rob

"May your heart always be joyful And may your song always be sung May you stay forever young " - Dylan

CUCM 9.1.1a CFA override by CFNA

This might be the issue.

I guess I will have to open a case.

Thanks!

CUCM 9.1.1a CFA override by CFNA

Answer:

The system works as it should work.

The loop breakout was introduced in CUCM 7.0(1). Futher desciption of this 'feature' can be found in the system guide of the corresponding CUCM version.

For example page 522 of system guide for CUCM 9.1 (http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/9_1_1/ccmsys/CUCM_BK_C5565591_00_cucm-system-guide-91.pdf)

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