16 Overview | Nortel Networks Confidential |
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With simultaneous ringing, the call terminates to multiple routes at the same time. The first terminating route to answer is accepted and the rest of the routes are released.
With sequential ringing, the call tries to terminate to only one of several routes at a time. Route advancement occurs whenever an error response is received, a provisionable No Answer timer expires, or a redirect response is received.
Call Processing Language
The SIP Application Module supports the use of the Call Processing Language (CPL), based on the IETF CPL draft,
For example, subscribers can include CPL scripts in the body of registration requests that contain instructions for location lookups and call screening, a process that is actually done through the Call Manager in the Personal Agent.
SIP Application Module stores the request. When the SIP Application Module is queried for routing information for a subscriber who has valid data stored in the database, the software returns the script along with the routing information. The SIP Application Module applies the CPL script to the returned routes and can eliminate or alter the routes based on the CPL script.
CPL scripts do not support the following:
•Remove location
•Mail option
•Log option
Interworking services
Discriminator service
The SIP Application Module screens requests bound for devices that are not fully SIP compliant, for example, the Communication Server for Enterprise (CSE) 2000. These components cannot process all types of signaling and certain media change requests. Therefore, the
SIP Application Module either performs the requested operation or rejects the request and responds with an error response.
The Discriminator service works with various gateways and SIP clients using provisioning facilities implemented by the SIP Application Module. As gateways or SIP clients with limited SIP capability are added to the network, this service can be configured to support these
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