[cisco-voip] MTP errors

[Kevin Thorngren]

As Ryan stated these are usually a problem when a transcoder is being 
invoked and not available.  If this was during normal call setup then 
the call would be disconnected.  I have seen many cases where these 
errors show up when MoH is being invoked.  For example, if the MoH 
server is not configured for the G.729 codec but the Region config 
would use G.729 between the MoH server and the held device then a 
transcoder would be invoked.  If none are available you will see this 
error but the call won't be disconnected there just wouldn't be MoH.  
You can either enable the G.729 codec or provide a transcoder for the 
device being held.  Detailed CCM traces show this issue too.

Kevin
On Sep 22, 2005, at 10:56 AM, Ryan Ratliff wrote:

> You also get these errors when CM tries to invoke a transcoder where
> none is available.   The best thing to do is grab a CCM trace that
> covers the time of one of the errors and see what's going on.  If you
> need help analyzing feel free to unicast it to me.
>
> -Ryan
>
> On Sep 22, 2005, at 10:34 AM, Nick Kassel wrote:
>
> We currently have 12 x H323 gateways, none of them have 'use mtp' 
> option
> in the configuration but there is an option for Media Termination Point
> Required which is unticked in all of them.
>
> -----Original Message-----
> From: Walenta, Phil [mailto:philip.walenta at berbee.com]
> Sent: Thursday, September 22, 2005 3:13 PM
> To: Nick Kassel; cisco-voip at puck.nether.net
> Subject: RE: [cisco-voip] MTP errors
>
> This error would suggest that you are using MTP resources on some H.323
> devices, and that all of them have been used.  Do you have H.323
> gateways with "use MTP" checked in the configuration?
>
> MTP's are used to "anchor" a call from an H.323 device that does not
> have the ability to support supplementary services such as hold or 
> music
> on hold.  Without an MTP, a call from a device like this would drop the
> second someone would attempt a transfer, hold etc.
>
> ________________________________
>
> From: cisco-voip-bounces at puck.nether.net on behalf of Nick Kassel
> Sent: Thu 9/22/2005 9:08 AM
> To: cisco-voip at puck.nether.net
> Subject: RE: [cisco-voip] MTP errors
>
>
>
>
>
> We were getting a lot of these errors previously and we managed to fix
> it by setting up the media resource group, but we seem to be getting
> them again now and I thought this could be because we have since added
> additional remote sites to our cluster.
>
>
>
>
>
> ________________________________
>
> From: Leetun, Rob [mailto:rleetun at co.boulder.co.us]
> Sent: Thursday, September 22, 2005 2:49 PM
> To: Nick Kassel
> Subject: RE: [cisco-voip] MTP errors
>
>
>
> We see this in our system too.  We have been told by Cisco TAC to
> disregard these errors.  It will be interesting to see how the others
> respond.
>
>
>
> ________________________________
>
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Nick Kassel
> Sent: Thursday, September 22, 2005 7:44 AM
> To: cisco-voip at puck.nether.net
> Subject: [cisco-voip] MTP errors
>
> We are getting a lot of MTP resource errors such as below, at present 
> we
> have on Media resource group set up with Annunciator, Conference 
> bridge,
> Media Termination Point and Music On Hold. We are currently adding this
> MR group into the devices of all our remote sites.
>
>
>
> The device pool on these Media Resources is set to London which is our
> HQ, should I be setting up these resources for each remote site
> selecting the correct device pool and then adding them into there own
> Media Resource group per site.
>
>
>
> Event Type:       Error
>
> Event Source:    Cisco CallManager
>
> Event Category: None
>
> Event ID:          3
>
> Date:                9/22/2005
>
> Time:                2:36:01 PM
>
> User:                N/A
>
> Computer:
>
> Description:
>
> Error: MtpNoMoreResourcesAvailable - No more MTP resources available.
>
>    App ID: Cisco CallManager
>
>    Cluster ID:
>
>    Node ID:
>
> Explanation: MTP resource is not available.
>
> Recommended Action: Install additional MTP or transcoder resources..
>
>
>
>
>
>
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