Manual

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.
Cisco Expressway Basic Configuration Deployment Guide (X8.5.2) Page 41 of 57
Appendix 2: DNS records