Cisco Cisco TelePresence Management Suite (TMS) Version 15
Setting up DNS for Cisco IP Video Phone E20 provisioning
Cisco TelePresence Management Suite Agent Legacy Deployment Guide (13.2)
Page 40 of 55
For an unencrypted TCP connection, use the following type of record to point to the TCP SIP service:
example.com. IN NAPTR 90
50
"s"
"SIP+D2T"
""
_sip._
tcp.example.com.
For a unencrypted UDP connection, use the following type of record to point to the TCP SIP service:
example.com. IN NAPTR 100
50
"s"
"SIP+D2U"
"" _sip._
udp.example.com.
SRV records
An SRV record or Service record is used to indicate the location, priority and weight of a service, in this case
the Cisco VCS. SRV records can offer load-balancing capabilities to an E20/Cisco VCS/Cisco TMS
deployment.
the Cisco VCS. SRV records can offer load-balancing capabilities to an E20/Cisco VCS/Cisco TMS
deployment.
SRV records for external endpoint provisioning
The SRV record points to the port number and the A record (see below) of the provisioning server.
For encrypted TCP:
_sips._tcp.example.com. IN SRV 0 1 5061 vcs.example.com.
For unencrypted TCP:.
_sip._tcp.exmple.com. IN SRV 0 1 5060 vcs.example.com.
For unencrypted UDP:
_sip._udp.example.com. IN SRV 0 1 5060 vcs.example.com.
A records
An A record or Address record is used to map a hostname to an IP address. In addition to NAPTR and SRV
records, the DNS server must also be configured with one A record for each provisioning server.
records, the DNS server must also be configured with one A record for each provisioning server.
Based on the above SRV examples, the A record of the provisioning server that the SRV record points to
should be:
should be:
vcs
IN
A
<ip address of the provisioning server>
Verifying the DNS records
To verify that your DNS records are set up and work as expected, use the tool nslookup or similar. Type, for
example:
example:
nslookup -querytype=srv _sip._udp.example.com
and then check the output.