Cisco Cisco Expressway
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.
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.
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.
the 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
TRAVERSAL_TYPE
TYPE_[UNDEF / ASSENTSERVER / ASSENTCLIENT /
H460SERVER / H460CLIENT / TURNSERVER /
TURNCLIENT / ICE]
H460SERVER / H460CLIENT / TURNSERVER /
TURNCLIENT / ICE]
UNAUTHENTICATED_SOURCE_ALIAS
UTCTIME
ZONE_NAME
could use in its response.
Cryptography support
External policy servers should support TLS and AES-256/AES-128/3DES-168.
SHA-1 is required for MAC and Diffie-Hellman / Elliptic Curve Diffie-Hellman key exchange; the Expressway
does not support MD5.
does not support MD5.
External Policy on Cisco Expressway Deployment Guide (X8.2)
Page 8 of 21
External policy request parameters