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Appendix 2:  DNS Records
The following records are required in the local DNS which hosts the internally routable domain: internal-domain.net to 
allow internal messages to be routed to the Cisco Expressway-C.
Local DNS A Record
Host
Host IP address
expc.internal-domain.net
10.0.0.2
Local DNS SRV Records
Name
Service
Protocol
Priority
Weight
Port
Target host
internal-domain.net.
h323cs
tcp
10
10
1720
expc.internal-domain.net.
internal-domain.net.
h323ls
udp
10
10
1719
expc.internal-domain.net.
internal-domain.net.
sip
tcp
10
10
5060
expc.internal-domain.net.
internal-domain.net.
sip
udp *
10
10
5060
expc.internal-domain.net.
internal-domain.net.
sips
tcp
10
10
5061
expc.internal-domain.net.
* SIP UDP is disabled on Expressway by default.
For example, the DNS records would be:
 
_h323cs._tcp.internal-domain.net. 86400 IN SRV 10 10 1720 expc.internal-domain.net.
 
_h323ls._udp.internal-domain.net. 86400 IN SRV 10 10 1719 expc.internal-domain.net.
 
_sip._tcp.internal-domain.net.    86400 IN SRV 10 10 5060 expc.internal-domain.net.
 
_sip._udp.internal-domain.net.    86400 IN SRV 10 10 5060 expc.internal-domain.net.
 
_sips._tcp.internal-domain.net.   86400 IN SRV 10 10 5061 expc.internal-domain.net.
 
expc.internal-domain.net.         86400 IN A 10.0.0.2
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Cisco Expressway Registrar Deployment Guide
Appendix 2:  DNS Records