[cisco-voip] SRV records for Jabber/Telepresence/MRA

[Andy]

I seem to have got myself into a stew and can’t seem to get in my mind what I need to do with SRV records.
I’m trying to deploy Expressway MRA and B2B.

We currently have an external DNS domain and a different internal domain.

For our internal domain which I’ll call andy.local we have the following SRV records setup.
_cisco-uds._tcp.andy.local 8443 10 10 sub1.andy.local
_cisco-uds._tcp.andy.local 8443 10 10 sub2.andy.local
_cuplogin._tcp.andy.local 8443 10 10 cups1.andy.local

For our External domain which I’ll call andy.com
_h323cs._tcp.andy.com 1720 10 10 videoconf.andy.com
_h323ls._udp.andy.com 1719 10 10 videoconf.andy.com
_sip._tcp.andy.com 5060 10 10 videoconf.andy.com
_sip._udp.andy.com 5060 10 10 videoconf.andy.com
_sips._tcp.andy.com 5061 10 10 videoconf.andy.com
_turn._udp.andy.com 3478 10 10 videoconf.andy.com
_collab-edge.tls.andy.com 8443 10 10 videoconf.andy.com

We have an A Record for videoconf.andy.com which points to our public address.

As it doesn’t work I raised a TAC case and the engineer changed my errors in the config, but also says I need to add _cisco-uds._tcp and _cuplogin._tcp for our external domain.
now I’m really confused as I thought that Jabber uses the DNS records to determine which side of the firewall it was by the dns records it receives when you boot the app.
Also videoconf.andy.com needs to be changed to match the FQDN of the VCSe or Expressway Edge server. 

We are running CUCM 9.1.2 with a single expressway-c and expressway-e running x8.5

TIA

Andy
andy.carse at gmail.com