I am confused and interested more in your configuration of DNS SRV. I am not a DNS person.
I have two DNS SRV records created, one for CUCM and one for CUPS. I am most concerned with the one you configure on the CUCM SIP Trunk. My DNS SRV record is configured as so:
Host that handles this service: pres01.domain.com
Host that handles this service: pres02.domain.com
Now, putting _sippres._tcp.domain.com on my SIP Trunk in CUCM isn allowing a SIP connection to form and I don receive presence status. CUCM can resolve the DNS SRV either. Ive read that you do not need to put the "_sippres._tcp." portion, but that just leaves my domain name "domain.com".
I see in other examples, including yours that you added a hotsname after the "_tcp" so it appeared as "_sip._tcp.<hostname>.domain.com". I don see where you add that hostname in the DNS SRV record. Am I missing something?
The only other option that I can think of is create a new A record that points to both of my CUPS servers such as "pres.domain.com". Then remove my DNS SRV records and create one just like:
Service: _sippres or _sip
Host that handles this service: pres.domain.com
Then in CUCM, don add the "_sippres._tcp.pres.domain.com", but just put the "pres.domain.com" and check the "Destination is an SRV" checkbox. Is this the correct way of doing it? It seems like it would juts be acting more as an A record than a DNS SRV at this point.