Nortel Networks Confidential | Overview 13 |
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details). If this step also fails, the SIP Application Module attempts a general DNS
Note: The DNS
If any of these steps succeed, the SIP Application Module routes the request. If all these methods fail, the SIP Application Module rejects the request.
Call Transfer service
The SIP Application Module handles the transfer on behalf of clients that do not support the call transfer service.
The SIP Application Module supports unattended Call Transfer through the Refer mechanism. Unattended Transfer (or Blind Transfer) refers to cases where the transferor redirects the transferee to the transfer target without first conferring with the transfer target. The transferor receives a Notify message, however, indicating whether the transfer was successful. If it was, the transferor releases the original call. If it was not, the transferor is reconnected to the transferee.
Local termination
The SIP Application Module first determines whether the incoming SIP request terminates to a client in a domain managed by the
SIP Application Module. The SIP Application Module performs local routing lookup through the Location Server, which is part of its internal software.
Telephony routing
When the SIP Application Module receives an incoming call, it looks up the callee in the database. If the callee is not in the database but the domain is served and the user portion of the URL is a Telephony routing number, the Telephony routing number is sent through the Telephony routing software within the Location Server.
The Telephony routing software must perform digit translation to find a gateway to terminate a call to. These tables are located in the Database Module. You can provision them through the Provisioning Client. For more information, refer to the SIP Provisioning Client User Guide and the MCP Database Module Basics document.
The Telephony routing service allows the SIP Application Module to
•provide unique dial plans for each subdomain
•provide routes to gateways or to other domains
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