[cisco-voip] Codec change issue

[Buchanan, James]

What protocol are the affected gateways running? Are they running H323? If so, are you using voice class codec with a list of codecs?

James Buchanan| UC Technology Manager | Presidio South | Presidio Networked Solutions
12 Cadillac Dr Ste 130 Brentwood, TN 37027 | jbuchanan at presidio.com<mailto:jbuchanan at presidio.com>
D: 615-866-5729 | F:615-866-5781  www.presidio.com<http://www.presidio.com/>

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of James Dust
Sent: Monday, April 30, 2012 10:40 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Codec change issue


Afternoon All,



We have recently changed our codec from G711 to G729 for a handful of our remote branches. We achieved this by changing the region on CUCM and updating our branch voice gateway by applying the preferred codec onto all the relevant dial peers.



However, we have had some examples of the following scenario:



Calls to an IP phone through a gateway fail when a transfer to another phone is attempted. The user picking up the transferred call receives a busy tone and then the call disconnects.



The voice gateway in question shows the incoming call codec as G729 and no errors appear when we apply a debug to the router.



Voice Gateway: 2801 (IOS - 12.4T)

CUCM Version: 7.1(3)

7970 phones



Has anyone come across this? Would be handy to know before I attempt to setup alerts on RTMT.


Kind Regards

James Dust
Team Leader
ICT Network Infrastructure & Communications Department
Charles Stanley & Co Ltd
Tel: 020 7149 6314
Mob: 07989 491136
mailto: james.dust at charles-stanley.co.uk<mailto:james.dust at charles-stanley.co.uk>


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