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D14049.03
MAY 2008
Grey Headline (continued)
TANDBERG VIDEO COMMUNICATIONS SERVER
ADMINISTRATOR GUIDE
Introduction Getting Started
Overview and
Status
System
Conguration
VCS
Conguration
Zones and
Neighbors
Call
Processing
Bandwidth
Control
Firewall
Traversal
Maintenance Appendices
SIP
Using the VCS as a SIP Registrar
In order for a SIP endpoint to be contactable via its registered
alias, it must register its location with a SIP Registrar. The VCS
can act as a SIP Registrar for up to 20 domains.
SIP aliases always take the form username@domain. To enable
the VCS to act as a SIP Registrar, you must congure it with
the SIP Domain(s) for which it will be authoritative. It will then
accept registration requests for any endpoints attempting to
register with an alias that includes that domain.
If no Domains are congured, then the VCS will not act as a SIP
Registrar.
Proxying Registration Requests
If the VCS has no domains congured, or it receives a
registration request for a domain for which it is not acting as a
Registrar, then the VCS may proxy the registration request. This
depends on the SIP Registration Proxy Mode setting, as follows;
Off
•
: the VCS will not proxy any registration requests. The
request will be rejected with a “403 Forbidden” message.
Proxy to Known Only
•
: the VCS will proxy the registration
request but only to its neighbors.
Proxy to any
•
: the VCS will proxy the registration requests in
accordance with its call policy (e.g. Administrator policy and
transforms). See Call Processing for more information.
About SIP on the VCS
The VCS supports the SIP protocol: it is both a SIP Proxy and SIP
Registrar, and will provide interworking between SIP and H.323
calls. In order to support SIP, SIP mode must be enabled and
at least one of the SIP transport protocols (i.e. UDP, TCP or TLS)
must be active.
SIP Registration Expiry
SIP endpoints must periodically re-register with the SIP Registrar
in order to prevent their registration expiring. You can congure
the interval with which SIP endpoints must register with the VCS.
SIP Overview
The SIP Registration Proxy Mode setting also impacts the
VCS’s behavior when acting as a SIP Proxy Server.
The SIP Registration Expiry setting applies only when the
VCS is acting as a SIP Registrar, and to endpoints
registered with the VCS. It does not apply to endpoints
whose registrations are being proxied through the VCS.