Nortel Networks NN10029-111 manual Call Transfer service, Local termination, Telephony routing

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Nortel Networks Confidential	Overview 13

details). If this step also fails, the SIP Application Module attempts a general DNS A-record lookup to route the request.

Note: The DNS A-record is the traditional response given by a DNS. It translates a domain name into an IP address.

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

Copyright © 2003, Nortel Networks

MCP SIP Application Module Basics

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Contents MCP SIP Application Module Page How this chapter is organized OverviewFunctional description OverviewAgent Client Internal Protocol Back-to-Back User Agent service UserANetwork configuration BiggerMart.com BigMart.comPublic network InterfacesProtocols PCP SQL Hardware Services and featuresRouting and Translation services Foreign termination Local termination Call Transfer serviceTelephony routing Relationship between Telephony routing stages SIP Aliases Multiple Route Termination Call Processing Language Interworking services Discriminator serviceService package enforcement Privacy Control serviceAuthentication services Bearer Path ControlConverged PC service Network/Address Hiding service Enterprise Clients Notification support Presence Instant MessagingVoicemail server interoperability and MWI Nortel Networks Confidential Overview Registration-static and dynamic Overload control Network address bookReliability and fault tolerance Manual failover OAM&P strategy Updating the SIP Application Module software UpgradesUpdating the Application Module from the menu tree Updating the SIP Application Module from the pull-down menu Load list for updating Progress of update Page Procedure 1 Clearing the SLE701 Slee Health Monitor alarm Alarm clearing proceduresProcedure 2 Clearing the SMDI101 alarm Configuration Configuration Nortel Networks Confidential Displaying help text Adding a component Procedure 1 Adding a componentAdding a component Configuration window top half Adding Services Progress dialog box Configuring the SIP Application Module tabs Field Value Description Application Server tab field descriptions Sheet 2Configuration Nortel Networks Confidential Nortel Networks Confidential Configuration Configuration Nortel Networks Confidential URL Configuration Nortel Networks Confidential Nortel Networks Confidential Configuration Configuration Nortel Networks Confidential Completing the Database Base tab fields DNS SRV Completing the Data Synchronization tab fields Locate User Svc tab field descriptions Sheet 2Configuration Nortel Networks Confidential Nortel Networks Confidential Configuration Configuration Nortel Networks Confidential Nortel Networks Confidential Configuration Completing the Local Accounting Manager tab fields Completing the In Memory Database tab fields Configuration Nortel Networks Confidential Memory Database tab field descriptions Sheet 2 Completing the Location Service tab fields Location Service tab field descriptions Sheet 2 Configuration Nortel Networks Confidential Nortel Networks Confidential Configuration Configuration Nortel Networks Confidential Nortel Networks Confidential Configuration Privatestaticaddress whose value Server.blade.host.label forCompleting the Server Subscription tab fields Addrsip Porthttp Portprotocol Nortel Networks Confidential Configuration Configuration Nortel Networks Confidential Nortel Networks Confidential Configuration Configuration Nortel Networks Confidential SipFwdAdapter tab field descriptions Sheet 2 Completing the Transport Management tab fields Nortel Networks Confidential Configuration Configuration Nortel Networks Confidential Nortel Networks Confidential Configuration Configuration Nortel Networks Confidential Nortel Networks Confidential Configuration Figure above Nortel Networks Confidential Configuration Transport Management tab subfields, cont’d Transport Management tab subfield descriptions Active-standby server group configuration Nortel Networks Confidential Configuration TCF Config details Additional SIP TCF Base tab configuration informationUDP/TCP/SSL Config values Parameter Value Description ExampleRetransmission Off parameter Invite Timer parameterTime Transaction parameter Add Defaults parameterCheck Mandatory Headers parameter Accounting management Page Performance management Page Security Security and AdministrationPage Voice plus video Appendix a Basic call flowsClient-to-client voice plus video diagram Application Client a Module Client B Client-to-client voice plus video call flowCall transfer Call transfer to client diagram Client a Client C Client BApplication Client a Module Client B Client C Call transfer blind to client call flowAppendix a Basic call flows Nortel Networks Confidential Failed call transfer call flow Appendix a Basic call flows Nortel Networks Confidential Authentication diagram AuthenticationApplication Client a Module Database Authentication call flowNortel Networks Confidential Appendix a Basic call flows Page Page Page Page MCP SIP Application Module