Administrator’s Guide for SIP-T3xG IP Phones
344
The call flow scenario is as follows:
1.
User A calls User B.
2.
User B is busy on the IP phone and unable or unwilling to take another call.
The call cannot be set up successfully.
User A
Proxy Server
User B
F1. INVITE B
F2. INVITE B
F3. 100 Trying
F4. 100 Trying
F5. 486 Busy Here
F6. 486 Busy Here
F7. ACK
F8. ACK
Summary of Contents for SIP-T38G
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