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Appendix A: Basic call flows 109
Copyright © 2003, Nortel Networks MCP SIP Application Module Basics
Nortel Networks Confidential
5. Client A sends another Register (SIP) message to the SIP
Application Module.
6. Again, the SIP Application Module returns a 100 Trying message to
Client A.
7. The SIP Application Module tells the Database Module to add this
user to the registration tables (SQL).
8. The Database Module tells the SIP Application Module that the
user is registered (SQL). Nothing is returned unless there is an
error. If there is no error code, the registration worked.
9. The SIP Application Module then contacts Client A with a
successful registration message (200 Registration Successful).