CUCM SIP trunk option ping DSCP value

[Difan Zhao]

I just noticed that all these option ping packets from the CUCM to the CME are all tagged with no DSCP values (or 0x00). How do I set it to CS3, so it will be the same as other VoIP signalling relevant traffic? I have checked the enterprise parameters and they look right to me.

I also don't see anything DSCP relevent settings under the SIP trunk or the SIP trunk profile config... Please help. Thanks!

[Ayodeji Okanlawon]

There is no special marking for options ping. It should be marked as every other sip traffic on port 5060 as cs3

[Difan Zhao]

Hi Ayodeji, thanks for the reponse and sorry for the delay.. I am seeing the traffic as DSCP 0. Is it abnormal? I will double check my switch to make sure thta they are not doing any markings. Thanks

[Chris Deren · Accepted solution]

Perhaps you are running into:

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCts66833/?rfs=iqvred