Cisco Cisco Expressway 维护手册
■
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
Expressway.
policy service is used, the decisions made by the policy service replace (rather than supplement) those made by the
Expressway.
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 Expressway as a fallback, if the service is not
available.
available.
■
The status and reachability of the service can be queried via a status path.
.
External Policy Request Parameters
When the Expressway uses a policy service it sends information about the call 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.
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.
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. It also indicates, where relevant, the
range of accepted values.
range of accepted values.
Parameter name
Values
ALLOW_INTERWORKING
TRUE / FALSE
AUTHENTICATED
TRUE / FALSE
AUTHENTICATED_SOURCE_ALIAS
AUTHENTICATION_USER_NAME
CLUSTER_NAME
DESTINATION_ALIAS
DESTINATION_ALIAS_PARAMS
GLOBAL_CALL-SERIAL_NUMBER
GUID
LOCAL_CALL_SERIAL_NUMBER
GUID
METHOD
INVITE / ARQ / LRQ / OPTIONS / SETUP
NETWORK_TYPE
IPV4 / IPV6
POLICY_TYPE
SEARCH / ADMIN
PROTOCOL
SIP / H323
REGISTERED_ALIAS
SOURCE_ADDRESS
SOURCE_IP
SOURCE_PORT
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Cisco Expressway Administrator Guide
Reference Material