Call Srv Records; Configuring Sip Srv Records; Example Dns Record Configuration - Cisco TelePresence Administrator's Manual
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Port is the port number that has been configured from
n
Registration UDP port
Call SRV records
Call SRV records (and A/AAAA records) are intended primarily for use by endpoints which cannot participate
in a location transaction, exchanging LRQ and LCF. The configuration of a Call SRV record should be as
follows:
_Service is _h323cs
n
_Proto is _tcp
n
Port is the port number that has been configured from
n
Call signaling TCP port.
Configuring SIP SRV records
RFC 3263
describes the DNS procedures used to resolve a SIP URI into the IP address, port, and transport
protocol of the next hop to contact.
If you want the VCS to be contactable using SIP URI dialing, you should configure an SRV record for each
SIP transport protocol enabled on the VCS (that is, UDP, TCP or TLS) as follows:
Valid combinations of _Service and _Proto are:
n
_sips._tcp
l
_sip._tcp
l
_sip._udp
l
Port is the IP port number that has been configured from
n
port for that particular transport protocol.
Example DNS record configuration
A company with the domain name example.com wants to enable incoming H.323 and SIP calls using URI
addresses in the format user@example.com. The VCS hosting the domain has the FQDN
vcs.example.com.
Their DNS records would typically be as follows:
SRV record for _ h323ls. _ udp.example.com returns vcs.example.com
n
SRV record for _ h323cs. _ tcp.example.com returns vcs.example.com
n
NAPTR record for example.com returns
n
_sip._tcp.example.com and
l
_sip._udp.example.com and
l
_sips._tcp.example.com
l
SRV record for _sip._udp.example.com returns vcs.example.com
n
SRV record for _sip._tcp.example.com returns vcs.example.com
n
SRV record for _sips._tcp.example.com returns vcs.example.com
n
A record for vcs.example.com returns the IPv4 address of the VCS
n
AAAA record for vcs.example.com returns the IPv6 address of the VCS
n
Cisco VCS Administrator Guide (X7.1)
Dial plan and call processing
VCS configuration > Protocols > H.323
VCS configuration > Protocols > H.323
VCS configuration > Protocols > SIP
as the
as the
as the
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