[cisco-voip] MTP - application log error

Wed Jul 12 15:50:13 EDT 2006

I meant G711 configured on the the VoIP Dial Peers that will be used outbound to the PSTN.  Your call will match a VoIP peer then match a POTS peer to be sent to the PSTN.  The default dial-peer codec is G729, so you'll need to specify the use of G711.  Either by:

Configuring a voice class:
voice class codec 1
codec preference 1 g711ulaw 
codec preference 2 g711alaw
codec preference 3 g729r8

dial-peer voice 2 voip
destination-pattern 3...
voice-class codec 1
voice-class h323 1
session target ipv4:10.1.21.39
dtmf-relay h245-alphanumeric
ip qos dscp cs3 signaling
no vad

or by using the "codec" command in dial-peer configuration.

Scott

________________________________

From: Erik Erasmus (E) [mailto:ErasmuE4 at telkom.co.za]
Sent: Wed 7/12/2006 3:37 PM
To: Scott Coner (US); Kevin Thorngren
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] MTP - application log error

Hi Scott

thanks for the input

don't you mean G729 in thedial peers - remember I want G711 on the lan and to pstn at all sites but use G729 between sites. This is something that is not 100% clear to me. The way I see it if a phone in a branch phones another phone in the same location they talk G711 controlled by CCM regions. If the same phone calls to pst then also it uses g711. If the sam phone calls another phone at HQ the phone can natively swop to G729 and talk onnet to HQ without using any transcoding because the phone at HQ via call manager signalling also knows to accept that call leg in G729. Or am I missing something here.

Is transcoding not just needed when the devices at the ends of the call leg can not natively support the codec required. Like for example a call to voicemail system that only supports G711 but you are making it across the wan and the remote phone needs to talk G729 to the HQ etc.

I also learned something about ATAs that might be a pointer on the use of theresources that baffle me - see may reply to the group earlier

erik 

________________________________

From: Scott Coner (US) [mailto:scott.coner at us.didata.com]
Sent: Wed 2006-07-12 17:50
To: Kevin Thorngren; Erik Erasmus (E)
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] MTP - application log error

Also be sure you specified the g.711 codec in your h.323 dial peers.

Scott

________________________________

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Kevin Thorngren
Sent: Wednesday, July 12, 2006 11:48 AM
To: Erik Erasmus (E)
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] MTP - application log error

Hi Erik, 

There are many reason why this could happen. Someone would need to look at the CCM traces to see what is really happening but here are a couple of ideas that won't actually cause call failures: 

- MoH to a G.729 Region where there is no Transcoder and the G.729 codec is not selected in the IPVMSA service parameters (you mentioned no MoH to the branches so this might not be the case). 

- A failure to allocate a transcoder when the annunciator is invoked. Do you hear the annunciator when placing calls that fail or do you just hear reorder? 

Kevin 

On Jul 12, 2006, at 9:46 AM, Erik Erasmus ((E)) wrote: 

	Hi 

	I am currently busy with implementation of IPt network. HQ with ccm 4-1-3sr3a, couple of branches with ISR routers as h323 voice gateways with local breakout via ISDN - to pstn. All phones register with central CCM server. In general working fine. I noticed something I am not sure about,  the application logg on the call manager shows error; not enogh MTP resources - add more MTP- transcoding resources. 

	At HQ we use G711, branches use g711 and branch to HQ and HQ to branch calls use G729. As far as I am concerned we are not using any MTP - the eventviewer in 2K also shows no MTP being used - so not sure why the application logg errors. 

	No MOH in branches yet only unicast MOH at HQ 

	Has anyone else seen this before. CCM4-1-3sr3a and OS2000-4-2 

	Erik Erasmus

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