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D 14049.01
07.2007
86
TANDBERG VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
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Introduction
Getting
Started
System
Overview
System
Configuration
H.323 & SIP
Configuration
Registration
Control
Zones and
Neighbors
Call
Processing
Firewall
Traversal
Bandwidth
Control
Maintenance
Appendices
TANDBERG
ADMINISTRATOR GUIDE
TANDBERG VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
Call
Processing
URI Dialing for Incoming Calls
URI Dialing
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
SRV record for _ h323cs. _ tcp.example.com returns vcs.example.com
SRV record for _ sip. _ udp.example.com returns vcs.example.com
SRV record for _ sip. _ tcp.example.com returns vcs.example.com
SRV record for _ sip. _ tls.example.com returns vcs.example.com
A record for vcs.example.com returns the IPv4 address of the VCS
AAAA record for vcs.example.com returns the IPv6 address of the VCS
How you add the DNS records depends on the type of DNS server you are using. Instructions for
setting up two common DNS servers are given in the Appendix DNS Configuration.
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Recommended Configuration
If URI dialing is being used in conjunction with firewall traversal, DNS zones and DNS Servers
should be configured on the VCS Border Controller and any VCSs on the public network only. VCSs
behind the firewall should not have any DNS zones or servers configured. This will ensure that
any outgoing URI calls made by endpoints registered with the VCS will be routed through the VCS
Border Controller.
In addition, the DNS records should be configured with the address of the VCS Border Controller
as the authoritative gatekeeper/proxy for the enterprise (see the Appendix DNS Configuration).
This ensures that incoming calls placed using URI dialing enter the enterprise through the VCS
Border Controller, allowing successful traversal of the firewall.
URI Dialing and Firewall Traversal