Nortel Networks NN10029-111 manual Authentication call flow, Application Client a Module Database

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108 Appendix A: Basic call flows		Nortel Networks Confidential

Figure 7 Authentication call flow

	SIP
	Application
Client A	Module	Database
Client A		Database

1.Register

2.100 Trying

4.401 Unauthorized

5.Register

6.100 Trying

9.200 Registration successful

3.Retrieve user profile

4.401 Unauthorized

7.Add user

8.User registered

The following steps provide more detail about the call flow:

1.Client A sends a Register (SIP) message to the SIP Application Module.

Initial requests never contain the user's credentials (basically, the initial request just contains a password). Client A makes the request, the SIP Application Server rejects it and gives them a piece of information called a nonce in the 401 Unauthorized message. The client takes that nonce and uses it to encrypt their password information and sends this back in the second request.

2.The SIP Application Module returns a 100 Trying message to Client A, then

3.The SIP Application Module attempts to retrieve the FROM party's subscriber information to see if they've been marked as INACTIVE in the system. This also causes the information to be cached at the SIP Application Server, so the same dip is not made to the database on the subsequent registration attempt. This profile information allows the system to determine what their password is in order to authenticate them.

4.In this case, the Database Module has returned a 401 Unauthorized message to the SIP Application Module, which sends the information on to Client A.

NN10029-111 Standard MCP 1.1 FP1 (02.02) April 2003

Copyright © 2003, Nortel Networks

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Contents MCP SIP Application Module Page Overview How this chapter is organizedOverview Functional descriptionBack-to-Back User Agent service UserA Agent Client Internal ProtocolNetwork configuration BigMart.com BiggerMart.comInterfaces Public networkPCP ProtocolsSQL Services and features HardwareRouting and Translation services Foreign termination Call Transfer service Local terminationTelephony routing Relationship between Telephony routing stages SIP Aliases Multiple Route Termination Interworking services Discriminator service Call Processing LanguagePrivacy Control service Service package enforcementAuthentication services Bearer Path ControlConverged PC service Network/Address Hiding service Enterprise Clients Notification support Instant Messaging PresenceVoicemail server interoperability and MWI Nortel Networks Confidential Overview Registration-static and dynamic Network address book Overload controlReliability and fault tolerance Manual failover OAM&P strategy Upgrades Updating the SIP Application Module softwareUpdating 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 Alarm clearing procedures Procedure 1 Clearing the SLE701 Slee Health Monitor alarmProcedure 2 Clearing the SMDI101 alarm Configuration Configuration Nortel Networks Confidential Displaying help text Procedure 1 Adding a component Adding a componentAdding a component Configuration window top half Adding Services Progress dialog box Configuring the SIP Application Module tabs Application Server tab field descriptions Sheet 2 Field Value DescriptionConfiguration 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 Locate User Svc tab field descriptions Sheet 2 Completing the Data Synchronization tab fieldsConfiguration 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 Server.blade.host.label for Privatestaticaddress whose valueCompleting 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 Additional SIP TCF Base tab configuration information TCF Config detailsUDP/TCP/SSL Config values Parameter Value Description ExampleInvite Timer parameter Retransmission Off parameterAdd Defaults parameter Time Transaction parameterCheck Mandatory Headers parameter Accounting management Page Performance management Page Security and Administration SecurityPage Appendix a Basic call flows Voice plus videoClient-to-client voice plus video diagram Client-to-client voice plus video call flow Application Client a Module Client BCall transfer to client diagram Client a Client C Client B Call transferCall transfer blind to client call flow Application Client a Module Client B Client CAppendix a Basic call flows Nortel Networks Confidential Failed call transfer call flow Appendix a Basic call flows Nortel Networks Confidential Authentication Authentication diagramAuthentication call flow Application Client a Module DatabaseNortel Networks Confidential Appendix a Basic call flows Page Page Page Page MCP SIP Application Module