Cisco Cisco Expressway
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
If you have a cluster of Expressway-Cs, you must set up DNS A and SRV records for each peer/host in the
cluster. See Expressway Cluster Creation and Maintenance Deployment Guide for more information.
cluster. See Expressway Cluster Creation and Maintenance Deployment Guide for more information.
Cisco Expressway Basic Configuration Deployment Guide (X8.5)
Page 41 of 56
Appendix 2: DNS records