Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
external policy server can make routing decisions based on data available from any source that the policy server has
access to, allowing companies to make routing decisions based on their specific requirements.
access to, allowing companies to make routing decisions based on their specific requirements.
When the VCS is configured to use an external policy server the VCS sends the external policy server a service
request (over HTTP or HTTPS), the service will send a response back containing a CPL snippet which the VCS will
then execute.
request (over HTTP or HTTPS), the service will send a response back containing a CPL snippet which the VCS will
then execute.
Using an External Policy Server
The main areas where the VCS can be configured to use an external policy server are:
■
Registration Policy – to allow or reject registrations.
■
Call Policy (also known as Admin Policy) – to control the allowing, rejecting, routing (with fallback if calls fail)
and forking of calls.
and forking of calls.
■
Search rules (policy can be applied for specific dial plan search rules).
Each of these areas can be configured independently of each other as to whether or not to use a policy service. If a
policy service is used, the decisions made by the policy service replace (rather than supplement) those made by the
VCS.
policy service is used, the decisions made by the policy service replace (rather than supplement) those made by the
VCS.
When configuring policy services:
■
Up to 3 external policy servers may be specified to provide resiliency (and not load balancing).
■
Default CPL can be configured, to be processed by the VCS as a fallback, if the service is not available.
■
The status and reachability of the service can be queried via a status path.
If you require FindMe functionality beyond that provided by VCS / Cisco TMS, we recommend that you implement it
through Call Policy.
through Call Policy.
.
External Policy Request Parameters
When the VCS uses a policy service it sends information about the call or registration request to the service in a
POST message using a set of name-value pair parameters. The service can then make decisions based upon these
parameters combined with its own policy decision logic and supporting data (for example lists of aliases that are
allowed to register or make and receive calls, via external data lookups such as an LDAP database or other
information sources).
POST message using a set of name-value pair parameters. The service can then make decisions based upon these
parameters combined with its own policy decision logic and supporting data (for example lists of aliases that are
allowed to register or make and receive calls, via external data lookups such as an LDAP database or other
information sources).
The service response must be a 200 OK message with CPL contained in the body.
The following table lists the possible parameters contained within a request and indicates with a ü in which request
types that parameter is included. It also indicates, where relevant, the range of accepted values.
types that parameter is included. It also indicates, where relevant, the range of accepted values.
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Cisco TelePresence Video Communication Server Administrator Guide