[cisco-voip] iLBC and Gateways

Wed Apr 15 21:42:52 EDT 2009

OK, weird... On a call, iLBC with an MGCP gateway... I conference on a 3rd
party and the call switches to G.711 (as it should)... however, I get dead
air... one party disconnects and the call goes back to iLBC and works
fine...

Gateway is a Cisco 2851 running 12.4.22T, CUCM 7.0(1)

I have one PRI, but two PVDM2-64s and one PVDM2-32 in the router...

Jonathan

On Wed, Apr 15, 2009 at 8:19 PM, Jonathan Charles <jonvoip at gmail.com> wrote:

> That seems dumb...
>
> I got it to work fine with MGCP...
>
> Also, I am noticing that my 7965s are not switching to 711 for conf calls
> and we just get dead air...
>
>
> J
>
>
> On Mon, Jan 19, 2009 at 11:17 AM, Ryan Ratliff <rratliff at cisco.com> wrote:
>
>> Apparently IOS supports it (for H.323) but for some reason CUCM doesn't.
>> Not sure if it's a roadmapped feature or not.
>>
>> -Ryan
>>
>> On Jan 19, 2009, at 11:11 AM, Ryan Ratliff wrote:
>>
>> I suspect H.245 doesn't support iLBC (yet).
>> Looking in the ASN description from
>> http://www.packetizer.com/ipmc/h323/standards.html the latest H.245
>> version doesn't seem to list iLBC.
>> I could be reading it wrong though...
>>
>> -Ryan
>>
>> On Jan 19, 2009, at 10:53 AM, STEVEN CASPER wrote:
>>
>> TAC just sent me an email that iLBC is not supported on h323
>> gateways....strange I wonder why?
>>
>>
>> http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/6x/trunks.html#wp1044377
>>
>> I checked the SRND for CUCM 7.x Ilbc is not listed as a supported codec
>> there either.
>>
>> Steve
>>
>>
>>  STEVEN CASPER <SCASPER at mtb.com> 01/16/09 8:34 AM >>>
>>
>> Got this to work with a MGCP gateway. Had to add/do the following:
>>
>> mgcp codec ilbc
>> ccm-manager mgcp codec-allno mgcp mgcp Still can not negotiate using H323,
>> opened a TAC case, will post fix when I get it. Steve
>> Please consider the impact on our environment before printing this e-mail.
>>
>>
>>  Ryan Ratliff <rratliff at cisco.com> 12/22/2008 11:18 AM >>>
>>
>> What type of gateway is it? If H.323 make sure iLBC is either set on the
>> voip dial-peer or in a codec class applied to the dial-peer.
>>
>> If MGCP check out
>> http://www.cisco.com/en/US/docs/ios/12_4t/12_4t15/it_amrnb.html.
>>
>>
>>
>> -Ryan
>>
>> On Dec 22, 2008, at 11:06 AM, STEVEN CASPER wrote:
>>
>> Doing some testing with iLbc. I can place a call from IP phone (7962) to
>> IP phone 7962 using iLbC and 7962 to IP Communicator 7 and I see I am using
>> the iLBC codec on each end of the connection. I negotiate G729 when I use a
>> gateway to reach the PSTN. Far as I can tell all is set up correctly with my
>> regions, locations, device pools etc. Is iLBC supported in the following
>> path between the phone and gateway?
>> 7962 --IP------2851-------PRI-------PSTN
>> Gateway is running 12.4.20T and CUCM is 6.1.1
>> Thanks
>> Steve
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