[cisco-voip] Media Termination Point

[Peter Slow]

Andre,
  Multicast MoH is not supported with MTPs or transcoders. CCM
probably allocated a unicast stream for your MTP.  when you placed the
PSTN leg of the call on hold and were usign an MTP, you got around
whatever was causing your Multicast MoH not to work by causing CCM to
use unicast. silence on hold indicates that the multicast RTP wasn't
makign it to the destination gateway, or that there was a
configuration problem on that gateway.

On Tue, Nov 18, 2008 at 9:47 AM, Andre Beck <cisco-voip at ibh.net> wrote:
> Hi,
>
> On Tue, Nov 04, 2008 at 03:42:19PM +0100, Tim Smith wrote:
>>
>> You would not typically require an MTP with a 2800 series gateway. It will
>> support all the functions natively.
>>
>> So in short, your VAR has most likely done the right thing. Modern gateway
>> in standard setup should not require an MTP. To be sure keep an eye on RTMT
>> alerts / logs for increased Media resource list exhausted events though.
>
> I repeatedly stumbled over a certain situation where not having an MTP
> actually leads to a problem even with only Cisco C(U)CM and Cisco gateways
> involved. That is when
>
> * The CCM and Gateway are connected via H.323 (either as a simple gateway
>  or by mediation of a gatekeeper) and
> * Multicast MoH is configured.
>
> In this situation, the PSTN side of a call will not hear MoH but just
> receive silence unless the H.323 gateway is supplied with an MTP on the
> CCM side.
>
> I've seen this with 4.1.x and 5.x so far. With 5.x I had stability issues
> with the MTP stuff and disabled both MMoH and MTPs to get rid of it. A year
> of patches later, maybe I should retry this.
>
> For more information, just scan back in this mailing list (archives), I
> think I posted more detailed versions of my MTP issues here.
>
> HTH,
> Andre.
> --
>   Real men don't make backups of their mail. They just send it out
>    on the Internet and let the secret services do the hard work.
>
> -> Andre Beck    +++ ABP-RIPE +++      IBH IT-Service GmbH, Dresden <-
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