Excessive CME SCCP UDP Multicast traffic

Unanswered Question
Jul 2nd, 2009

I noted what seems to be excessive multicast traffic coming from a CME 2821 and was a-wonderin what would be considered normal.

I am seeing about 55 packets per second (3300 per minute) of the following:

Source: CME Router


Protocol: UDP

Source Port: cisco-sccp

Destination Port: cisco-sccp

Data: no human readable :)

Is this normal or is something fishy going on here.

I have this problem too.
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Overall Rating: 4.9 (13 ratings)
ilnman1234 Wed, 09/01/2010 - 11:10

I am having a problem with multicast UDP traffic causing slowness on the network.  it's broadcasting multicast cisco-sccp packets about 200 a second to every one in the place.  Below is the results of traffic monitoring on the network.

1121    21.200753    UDP    Source port: cisco-sccp  Destination port: cisco-sccp

So you think that the above indicates MOH traffic?

Wouldnt the ports be different if it were MOH?

frlindse Wed, 09/01/2010 - 11:20

Could you capture a Wireashark trace for a few seconds?

frlindse Wed, 09/01/2010 - 12:01

Look under telephony-service in the router config, what are the two lines that start with


multicast moh

ilnman1234 Wed, 09/01/2010 - 12:09

Bingo.....  so if I turn this off how will MoH work? 

moh flash:/media/music-on-hold.au

multicast moh port 2000

frlindse Wed, 09/01/2010 - 12:23

If you turn multicast MOH off you will not get MOH for ip phone to ip phone

calls(only TOH), you will still get MOH for PSTN calls that arew placed

on hold

ilnman1234 Wed, 09/01/2010 - 12:24

Is there anyway to do the IP Phone to IP Phone without using multicast?  Is there a such thing as unicast MoH?

frlindse Wed, 09/01/2010 - 12:38

Yes unicast MOH is an option, however it has a maximum of only 10 phones because it places more load on the router

ilnman1234 Wed, 09/01/2010 - 12:50

Ok,  Well thank you very much for your help.  Much appreciated.

frlindse Wed, 09/01/2010 - 12:59

Not a problem,   Good Luck

good ratings are my reward :^)


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