[cisco-voip] Gateway to G.729 Region calls

[Bill Talley]

Dug out my notes.  Here's the issue I ran into:

CSCsc07492 Bug Details 
 Skinny (G729)-CCM-MGCP calls fail intermittently  
Symptoms:

Calls from MGCP GW to IP phones via Call Mgr intermittently have dead air /
no
audio

Conditions:
Occurs when MGCP GW is using G729 to the phones and the IOS on the MGCP GW
is
12.4.4T or higher 12.4T

Workaround:
- Disable G729 Annex B on the Call Manager
- Make sure any transcoders / MTP resources on Call Mgr use only G729r8 and
not
G729ar8 / G729br8



-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Bill Talley
Sent: Thursday, March 06, 2008 7:54 AM
To: Matthew Melbourne; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Gateway to G.729 Region calls

I encountered this same scenario  problem awhile back and am fuzzy on the
details, but I believe it had to do with silence suppression for g729 calls
across a gateway... It's been quite awhile and I could be wrong, but I think
that was case.  Had to disable it.

*** Sent from a mobile device with very tiny keys.  Please excuse my typos.
***



-----Original Message-----
From: "Matthew Melbourne" <matt at melbourne.org.uk>
To: "cisco-voip at puck.nether.net" <cisco-voip at puck.nether.net>
Sent: 03/06/08 7:35 AM
Subject: [cisco-voip] Gateway to G.729 Region calls

Hi,

I'm just setting up a Region for using G.729 across the WAN. In
addition, we have introduced some transcoding resources for access to
CRS and Unity (and this works fine using a G.729-only Region; I can
see transcoding resources being invoked).

However, more fundamentally, called entering the voice gateways from
the PSTN, and destined for G.729-only handsets are being set up, but
there is no audio (in either direction). If I place the call on hold
on the IP Phone, the other end hears CCM MoH and when the call is
released, the audio path is present, using the G.729 codec.

On the gateway, I can see that the G.729 VOIP leg has been established
(before and after the call is placed on hold):

voice-gw1#sh call active voice compact | inc g729
49632 ORG     T781   g729br8     VOIP        P       10.80.2.42:16384
49631 ORG     T781   g729br8     TELE        P

The gateways are MGCP-controlled and are running 12.4(15)T3.

If I change the phone's Region to use G.711 only, then everything is fine.

Cheers,

Matt

-- 
Matthew Melbourne
_______________________________________________
cisco-voip mailing list
cisco-voip at puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip
CONFIDENTIALITY NOTICE: This electronic mail transmission (including any
accompanying attachments) is intended solely for its authorized
recipient(s), and may contain confidential and/or legally privileged
information. If you are not an intended recipient, or responsible for
delivering some or all of this transmission to an intended recipient, be
aware that any review, copying, printing, distribution, use or disclosure of
the contents of this message is strictly prohibited. If you have received
this electronic mail message in error, please delete it from your system
without copying it, and contact sender immediately by Reply e-mail, or by
calling 913-307-2300, so that our address records can be corrected.

 

Although this e-mail and any attachments are believed to be free of any
virus or other defect that might negatively affect any computer system into
which it is received and opened, it is the responsibility of the recipient
to ensure that it is virus free and no responsibility is accepted by the
sender for any loss or damage arising in any way in the event that such a
virus or defect exists.

_______________________________________________
cisco-voip mailing list
cisco-voip at puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/x-pkcs7-signature
Size: 3072 bytes
Desc: not available
Url : https://puck.nether.net/pipermail/cisco-voip/attachments/20080306/14c08cba/attachment-0001.bin 
-------------- next part --------------
CONFIDENTIALITY NOTICE: This electronic mail transmission (including any accompanying attachments) is intended solely for its authorized recipient(s), and may contain confidential and/or legally privileged information. If you are not an intended recipient, or responsible for delivering some or all of this transmission to an intended recipient, be aware that any review, copying, printing, distribution, use or disclosure of the contents of this message is strictly prohibited. If you have received this electronic mail message in error, please delete it from your system without copying it, and contact sender immediately by Reply e-mail, or by calling 913-307-2300, so that our address records can be corrected.

 

Although this e-mail and any attachments are believed to be free of any virus or other defect that might negatively affect any computer system into which it is received and opened, it is the responsibility of the recipient to ensure that it is virus free and no responsibility is accepted by the sender for any loss or damage arising in any way in the event that such a virus or defect exists.