I'm trying to get Call-Back from CMR cloud to my video system, I add the attach SRV records to the external DNS :
I unable to get call back, I think that the first SRV record is duplicated ( it connects to some other OCS for federation ) and cause us the issue.
I unable to see any logs at the Expressway E.
Could it be that this one is causing us the issue ?
Should I add some other SRV record ?
I did a lookup of that domain "nice.com" and there are not SRV records for either H323 or SIP.
SRV records need to be in place for the SIP domain on the external network and point to your Expressway-E. According to what you listed, the address used in the SRV record is incorrect, suggest you review the deployment guide I linked to in my earlier reply.
The SRV records you should have are:
The target for each of these should be:
tlvexpe01.nice.com (your Expressway-E)