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Appendix A: Basic call flows 107
Copyright © 2003, Nortel Networks MCP SIP Application Module Basics
Nortel Networks Confidential
22.SIP Application Module sends an Invite (Unhold) to Client B.
23.Client B responds with a 200 OK.
24.The SIP Application Module sends the Invite to Client A.
25.Client A responds with an Ack.
26.The SIP Application Module sends an Ack to Client B and the call
is re-established.
Authentication
Figure 6, “Authentication diagram,”and Figure 7, “Authentication call
flow,” show the basic call flow for Authentication. You can configure the
SIP Application Module to support Authentication on Invite or
Authentication on Registration. Following these diagrams is a detailed,
step-by-step example of Authentication on Registration.
Figure 6 Authentication diagram