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Yealink SIP-T2XP

Yealink SIP-T2XP
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Administrators Guide for SIP-T2xP IP Phones
188
The following figure illustrates the scenario of an unsuccessful call due to the reason of
the called user being busy. In this scenario, the two end users are User A and User B.
User A and User B are located at the Yealink SIP IP phones.
The call flow scenario is as follows:
1. User A calls User B.
2. User B is busy on the phone and unable or unwilling to take another call.
The call cant 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

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