[cisco-voip] Strange intermittent MoH problem

[Ryan Ratliff]

Does MP use multicast audio for it's RTP streams?   Since each MOH  
source gets its own multicast IP address/port if MP is sending  
multicast for a conference (I have no idea if it does this or not)  
and it ends up sending on the same IP/port the MOH server is using  
then this could happen.

I'd work to get a sniffer capture so you can see what the phone is  
receiving.

-Ryan

On Apr 1, 2008, at 4:26 PM, Erick Bergquist wrote:
The mcast config is normal, nothing special being done outside the
norm. IP phones hear this as well as outside callers on a H323 gateway
when on hold sometimes.

On Tue, Apr 1, 2008 at 3:13 PM, Tim Reimers  
<treimers at ashevillenc.gov> wrote:
> Something in the multicast configuration of the involved layer 2
>  devices?
>
>
>
>  -----Original Message-----
>  From: cisco-voip-bounces at puck.nether.net
>  [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Erick  
> Bergquist
>  Sent: Tuesday, April 01, 2008 4:06 PM
>  To: Ryan Ratliff
>  Cc: cisco-voip at puck-nether.net
>  Subject: Re: [cisco-voip] Strange intermittent MoH problem
>
>  Both the music and the MP call, but it is clear and not cutting  
> and out
>  every second or so.
>  When I've caught it happening, it seems to be calls where MoH is  
> playing
>  due to a Network Hold event (parked call, etc). I can't get it to  
> happen
>  with a user hold.
>
>  On Tue, Apr 1, 2008 at 2:32 PM, Ryan Ratliff <rratliff at cisco.com>  
> wrote:
>> IP phones or PSTN calls?   Sounds like either crosstalk or a random
>>  two devices using the same receive port for RTP and the stream from
>> MP reaching the phone somehow.
>>  Do they hear just the MP audio or both MOH and MP audio alternating
>>  every second or so?   The former is crosstalk, the latter is both  
>> RTP
>>  streams reaching the phone on the port the phone is listening on.
>>
>>  -Ryan
>>
>>
>>
>>  On Apr 1, 2008, at 3:07 PM, Erick Bergquist wrote:
>>  Anyone ever see people on hold with Multicast MoH (Network Hold it
>> appears to happen with) hear a meetingplace audio conference call
>> while they are on hold? The CCM and MP are seperate servers with
>> different conference bridges so I'm puzzled how the person on hold
>> hears the MP conferences sometimes. It doesn't happen all the  
>> time. Is
>
>> real intermittent.
>>  The Call Manager is version 4.1(3)sr4d and MeetingPlace Enterprise
>  5.4.
>>
>>  Erick
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>>
>>
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