[cisco-voip] Nortel CS1000 to CME integration- H323

Fri Mar 4 12:47:12 EST 2011

Additionally, multiple h245 OLCs (versus the OLC-ish lines in an h225
fast connect message) might be caused by a mismatch in support or
PREFERENCE of a codec between tow sides. Sometimes there's a bit of
logic in one side that attempts to keep the codec in used the same in
both directions.
Imagine that:
Side A and B send each other a list of 729 and 711, in the tcs and
both sides responde with tcs ack
Side B tends to like or is configured to do g729 first, side A is
mildly unintelligent and wants to do 711 first, and ignores  the fact
that 729 was first/most preferred in the TCS *cough*callmanager*cough*

Side B sends an OLC for 729, Side A sends an OLC for 711 at roughly
the same time

Side A sees B's OLC and "crap, oops." and then sends a CLC followed by
a new OLC matching what B sent to it.

Badness and misunderstandings ensue, call does not go as planned.
The fix is generally to disable one of the multiple codecs so that
each side can only choose one, or reordering your voice class codec so
that both sides choose the same codec the first time.

-Peter

On Fri, Mar 4, 2011 at 12:28 PM, Peter Slow <peter.slow at gmail.com> wrote:
> That's expected and reproducible behavior. The phone is going to use
> UDP port 2000, and i believe the CME will proxy that RTP (So, the
> traffic  should be destined for the CME vs. directly to the nortel.)
>
> http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/srnd/design/guide/multcme.html#wp1071359
>
> -Peter
>
> On Fri, Mar 4, 2011 at 12:13 PM, Buchanan, James <jbuchanan at presidio.com> wrote:
>> Hello,
>>
>>  I have a customer attempting to integrate a Nortel CS1000 to a CME via H323. When a call is initiated from the Cisco side, everything works fine. However, if a call is initiated from the Nortel side, we have one way voice. Cisco says that two things are happening. They said that it appears that the Nortel is sending multiple OLCs to the CME. But, they also said that it appears that the CME is asking the IP phone to speak RTP on port 2000.
>>
>> I'm open to any suggestions you may have on where to look or what to change in the configuration.
>>
>> Thanks,
>>
>> James Buchanan | Technology Manager, UC | South Region | Presidio Networked Solutions
>> 12 Cadillac Dr, Suite 130, Brentwood, TN 37027 | jbuchanan at presidio.com
>> D: 615-866-5729 | F: 615-866-5781 | www.presidio.com
>> CCIE #25863, Voice
>>
>>
>>
>> -----Original Message-----
>> From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Erick B.
>> Sent: Friday, March 04, 2011 10:58 AM
>> To: c3voip
>> Cc: voip puck
>> Subject: Re: [cisco-voip] T.38 with VG248's and MGCP PRI Gateways
>>
>> Ended up doing VG224's... moved away from the 248.
>>
>> On Fri, Mar 4, 2011 at 8:25 AM, c3voip <c3voip at nc.rr.com> wrote:
>>> Erick,
>>>
>>> Did you get anywhere with your troubleshooting?  I am guessing the
>>> VG224's worked better.  I just want to know what your next steps were.
>>>
>>> -C
>>>
>>> -----Original Message-----
>>> From: cisco-voip-bounces at puck.nether.net
>>> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Erick B.
>>> Sent: Friday, October 22, 2010 5:34 PM
>>> To: voip puck
>>> Subject: Re: [cisco-voip] T.38 with VG248's and MGCP PRI Gateways
>>>
>>> Still having intermittent problems with this.
>>>
>>> Have been working with Cisco with out much changes. I am going to this
>>> location next week so can get captures then.
>>>
>>> So far have tried every combination of MGCP settings with same
>>> results, hit and miss.
>>>
>>> Need protocol-based MGCP T38 for connection to SIP FAX server (First
>>> Class), and have VG248s set for passthrough mode (Fax Relay disabled).
>>>
>>> Inbound FAX:s work fine (very few failures) but outbound FAX calls
>>> from VG248-attached FAX machines are the big problem. They are brother
>>> FAX machines and they do not have any settings or switches to change
>>> baud rate, disable ECM, disable SuperG3, etc.
>>>
>>> I am taking a VG224 out with me to use along side the VG248 and move
>>> the FAX machines over to VG224. Going to set the 224 up as MGCP same
>>> as PSTN MGCP gateways since SCCP only supports NSE based T38 (same as
>>> VG248) from my reading of the cisco documentation and a couple posts
>>> on cisco forums. So it looks like SCCP is limited to NSE based T38 if
>>> both can only do NSE (just a guess here).
>>>
>>> The VG248s and passthough worked fine on CCM 4.1 but has been hit and
>>> miss ever since move to CUCM 8.02. Gateways did not change. They are
>>> also having issues fax'ing between FAX machines on the same VG248 and
>>> they did not have those issues on older CCM version.
>>>
>>>
>>> On Wed, Oct 6, 2010 at 9:55 AM, Chris Clouse <Chris.Clouse at cdw.com> wrote:
>>>> If you are still having trouble, send a diagram of the call flow for
>>>> a
>>> working vs non-working fax and a Wireshark capture.
>>>>
>>>> Christopher  Clouse
>>>> Network Voice Engineer
>>>>
>>>> CDW Advanced Technology Services
>>>> 7145 Boone Ave N, Suite 140, Brooklyn Park, MN 55428 Single Number
>>>> Reach: 763.592.5887 chris.clouse at cdw.com
>>>>
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: Erick B. [mailto:erickbee at gmail.com]
>>>> Sent: Tuesday, October 05, 2010 11:52 PM
>>>> To: Chris Clouse
>>>> Cc: voip puck
>>>> Subject: Re: [cisco-voip] T.38 with VG248's and MGCP PRI Gateways
>>>>
>>>> Yea, have tried these and combinations and still have hit and miss FAXs.
>>> Where some FAX machines can call most numbers fine but not others.
>>>>
>>>> Let me try to take off the t38 force and leave fxr-package as not
>>>> default
>>> and see if that makes a difference (thats about the only combo I
>>> haven't tried yet).
>>>>
>>>> No ATAs, just FAX's off of VG248s.
>>>>
>>>> On Tue, Oct 5, 2010 at 9:41 PM, Chris Clouse <Chris.Clouse at cdw.com> wrote:
>>>>> I think this will do what you are looking for.  Be aware that mgcp
>>>>> fax
>>> t38 gateway force will break ATA's in your environment.
>>>>>
>>>>> mgcp package-capability fxr-package
>>>>> mgcp default-package fxr-package
>>>>> no mgcp t38 fax inhibit
>>>>> no ccm-manager fax protocol cisco
>>>>> no mgcp fax t38 ecm
>>>>> mgcp fax t38 gateway force
>>>>>
>>>>> Christopher  Clouse
>>>>> Network Voice Engineer
>>>>>
>>>>> CDW Advanced Technology Services
>>>>> 7145 Boone Ave N, Suite 140, Brooklyn Park, MN 55428 Single Number
>>>>> Reach: 763.592.5887 chris.clouse at cdw.com
>>>>>
>>>>>
>>>>>
>>>>> -----Original Message-----
>>>>> From: cisco-voip-bounces at puck.nether.net
>>> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Erick B.
>>>>> Sent: Tuesday, October 05, 2010 4:52 PM
>>>>> To: voip puck
>>>>> Subject: [cisco-voip] T.38 with VG248's and MGCP PRI Gateways
>>>>>
>>>>> Hi,
>>>>>
>>>>> Anyone ever do T.38 faxing with VG248s and MGCP PRI gateways?  Have
>>> client that needs to use T38 for a SIP FAX Server they have, but
>>> outbound calls to PSTN from Brother FAX Machines attached to VG248s are intermittent.
>>>  Sometimes they work, sometimes they don't. The Brother FAX machines
>>> have no way to change Baud rate or ECM settings, etc. They had no
>>> problems with passthrough (before the FAX Server was upgraded to SIP).
>>>>>
>>>>> Incoming FAX's work fine (a majority - very little issues reported).
>>>>> Most of these go to FAX server and some go directly to the FAX
>>>>> machines
>>> on the VG248's.
>>>>>
>>>>> The VG248 ports are set to T.38 peer to peer, and we've tried
>>>>> various
>>> MGCP T38 settings on the gateway with TAC's help but still having
>>> problems with outbound FAXs.
>>>>>
>>>>> Tried setting gateways to force t38 (mgcp fax t38 gateway force),
>>>>> tried
>>> removing the fxr-package as default (not needed for VG248 per TAC),
>>> and set the ls and hs redundancy settings to 0 (VG248 doesn't support
>>> redundancy), tried with with mgcp fax rate set to 9600 baud, ECM off
>>> on MGCP gateway, etc. Reset MGCP with these changes each time.
>>>>>
>>>>> Anyone know how to disable VG248 from using Passthrough mode? The
>>>>> port is
>>> set to T.38 peer to peer but when I try changing the Passthrough
>>> setting to "voice only - no passthrough" then no FAXs work at all with
>>> the FAX machine attached to the VG248 port (I bounced the port after the change also).
>>>>>
>>>>> Call Manager version is 8.02 with latest 12.4.24T IOS on gateways.
>>>>>
>>>>>
>>>>> Ideas anyone?
>>>>>
>>>>> Thanks, Erick
>>>>> _______________________________________________
>>>>> cisco-voip mailing list
>>>>> cisco-voip at puck.nether.net
>>>>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>>>>
>>>>
>>>
>>> _______________________________________________
>>> cisco-voip mailing list
>>> cisco-voip at puck.nether.net
>>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>>
>>>
>>
>> _______________________________________________
>> cisco-voip mailing list
>> cisco-voip at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>
>> _______________________________________________
>> cisco-voip mailing list
>> cisco-voip at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>
>