SIP Phone HW Conferencing on CME

[CSCO11510457]

HI

sip phones 7841 on CME (15.7(3)M3) cannot complete a HW conference in the internal network of company.

for example:

1. Phone A calls to Phone B

2. Phone B answer the call, and press the conference softkey, and call Phone C

3. after Phone C answer the call from Phone B, Phone B press the conference softkey again.

it shows that Phone A cannot merge to the conference.

I have referenced a lot of posts in the forum, but still cannot resolve the probllem.

output of "debug ephone hw-conference"

Apr 2 08:08:59.342: Check associated hwconf with callid 45082
Apr 2 08:08:59.342: Unable to associate a dn/chan with callid 45082
Apr 2 08:09:07.338: Check associated hwconf with callid 45082
Apr 2 08:09:07.338: Unable to associate a dn/chan with callid 45082
Apr 2 08:09:11.450: Check associated hwconf with callid 45082
Apr 2 08:09:11.450: Unable to associate a dn/chan with callid 45082
Apr 2 08:09:13.550: Check associated hwconf with callid 45084
Apr 2 08:09:13.550: Unable to associate a dn/chan with callid 45084
Apr 2 08:09:13.734: Check associated hwconf with callid 45085
Apr 2 08:09:13.734: Unable to associate a dn/chan with callid 45085
Apr 2 08:09:16.574: Check associated hwconf with callid 45082
Apr 2 08:09:16.574: Unable to associate a dn/chan with callid 45082
Apr 2 08:09:16.734: Check associated hwconf with callid 45082
Apr 2 08:09:16.734: Unable to associate a dn/chan with callid 45082
Apr 2 08:09:21.366: Check associated hwconf with callid 45093
Apr 2 08:09:21.366: Unable to associate a dn/chan with callid 45093
Apr 2 08:09:23.426: Check associated hwconf with callid -1
Apr 2 08:09:23.426: Unable to associate a dn/chan with callid -1
Apr 2 08:09:23.426: Check associated hwconf with callid 45094
Apr 2 08:09:23.426: Unable to associate a dn/chan with callid 45094
Apr 2 08:09:23.426: skinny_hwcfb_check_resource: for Audio
Apr 2 08:09:23.426: skinny_hwcfbi_find_next_mtpcb Got MTPCB conference type req 52:Audio only as Audio only Pass
Apr 2 08:09:23.426: skinny_hwcfb_get_adhoc_number:
Apr 2 08:09:23.426: skinny_hwcfb_get_adhoc_number : Failed to get ad-hoc conference resource
Apr 2 08:09:28.790: Check associated hwconf with callid -1
Apr 2 08:09:28.790: Unable to associate a dn/chan with callid -1
Apr 2 08:09:28.822: Check associated hwconf with callid 45082
Apr 2 08:09:28.822: Unable to associate a dn/chan with callid 45082

Best Regards,

[HARIS_HUSSAIN · Accepted solution]

Try Removing G729 Codec from Conference bridge

[CSCO11510457]

Hi HARIS_HUSSAIN, thanks for you reply. I remove G729 codec under the conference bridge, but the problem is still exists. dspfarm profile 2 conference codec g711ulaw codec g711alaw maximum sessions 2 associate application SCCP

[Maren Mahoney]

That error always makes me think there is missing config, but you have everything in place just fine. Although I must be missing something subtle, because the output of your "show telephony-service conference hardware" is blank and it should not be. You should see the A001 and A002 listed underneath. This means that the telephony-service is unable to allocate conference hardware because it doesn't think it has any available.

Try bouncing the telephony-service and then sccp:

config t

no sccp

telephony-service

 shutdown

 no shutdown

 exit

sccp

end

If the output of "show telephony-service conference hardware" is still blank, then debug sccp messages (and maybe debug sccp events) and bounce sccp again to see it attempting to register the conference bridge.

Let us know how this goes.

Maren

[CSCO11510457]

Hi Maren, thanks for your reply. I try to bounce the telephony-service and sccp, but cannot resolve the problem. Pls reference the attachment.

[Maren Mahoney]

Alright then. The debugs show the xcoder and the cfb fully registered.

So then, there must be an allocation issue. Please run the following pair of debugs and try to create a conference call, and post the results.

debug ephone hw-conference
debug ephone mtp

[CSCO11510457]

Hi Maren, I collect the output of "debug ephone hw-conference" and "debug ephone mtp". it looks like the same with debug ephone hw-conference.

[HARIS_HUSSAIN · Accepted solution]

Seems like a Bug Can you try with a Different IOS Version. Just upgrade to latest Stable IOS Version available.

*** Please rate helpful post; Mark "Accept as a Solution" if applicable

Thanks,
Haris

[CSCO11510457]

HI Haris, you are right, i downgrade to 15.6(3)M , then everything is ok. thanks for your help!!

[HARIS_HUSSAIN]

Great !! glad It worked. You can mark the thread as Solved by accepting the solution provided.
What was your Origianl IOS Version?

Thanks,
Haris

[CSCO11510457]

Hi Haris, 15.7(3)M3 I think it might shoot this BUG https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvn07969