The routing system determines a Subscriber Flow match by using additional matching criteria. It uses the following fields of server flow configuration for the match:
URI Group
SIP Signaling Interface
Via Host
Contact Host
User Agent
Source Subnet
To complete the matching, SIP routing system follows a sequence:
Uses the SIP To header URI of the incoming request for comparison with the provisioned URI Group to decide a match.
Upon finding a match, it validates whether the destination IP address of the request matches the provisioned IP Address field of the Signaling Interface configuration.
Compares the rest of the fields of the SIP request to match the provisioned values of Subscriber Flow. For example, Via Host, Contact Host, and Source Subnet.
If any one field does not match, the SIP routing system skips to the next Subscriber Flow, looking for a match from the set of Subscriber Flows.
SIP routing system proceeds with Inbound Policy Invocation only when it finds a Subscriber Flow match.
