Proxying Registration Requests; Vcs As A Sip Presence Server; Sip Configuration - Cisco TelePresence Administrator's Manual

In all cases, requests that do not have Route Sets are proxied as normal in accordance with existing call
processing rules. This setting only applies to dialog-forming requests, such as INVITE and SUBSCRIBE.
Other requests, such as NOTIFY, are always proxied regardless of this setting.

Proxying registration requests

If the VCS receives a registration request for a domain for which it is not acting as a Registrar (the VCS does
not have that SIP domain configured), then the VCS may proxy the registration request onwards. This
depends on the SIP registration proxy mode setting, as follows:
Off: the VCS does not proxy any registration requests. They are rejected with a "403 Forbidden" message.
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Proxy to known only: the VCS proxies the request in accordance with existing call processing rules, but
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only to known neighbor, traversal client and traversal server zones.
Proxy to any: this is the same as Proxy to known only but for all zone types i.e. it also includes ENUM and
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DNS zones.
Accepting proxied registration requests
If the VCS receives a proxied registration request, in addition to the VCS's standard
can also control whether the VCS accepts the registration depending upon the zone through which the
request was received. You do this through the Accept proxied registrations setting when
zone.
Proxied registrations are classified as belonging to the zone they were last proxied from. This is different from
non-proxied registration requests which are assigned to a subzone within the VCS.

VCS as a SIP Presence Server

The VCS supports the SIP-based SIMPLE protocol. It can act as a Presence Server and Presence User
Agent for any of the SIP domains for which it is authoritative. For full information on how to enable and use
the VCS as a SIP Presence server, see the

SIP configuration

The SIP page (VCS configuration > Protocols > SIP >
settings on the VCS, including:
whether SIP is enabled or not
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SIP-specific transport modes and ports
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certificate revocation checking modes for TLS connections
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registration settings for standard and outbound registrations
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The configurable options are:
Field Description
Configuration section:
Cisco VCS Administrator Guide (X7.2)
Presence section.
Configuration) is used to configure the SIP
registration controls, you
configuring a
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