Yealink SIP-T58V/A User Manual

Administrator’s Guide for SIP-T5 Series Smart Media Phones
804
Always Call Forward
The following figure illustrates successful call forwarding between Yealink SIP IP phones in which
User B has enabled always call forward. The incoming call is immediately forwarded to User C
when User A calls User B. In this call flow scenario, the end users are User A, User B, and User C.
They are all using Yealink SIP IP phones, which are connected via an IP network.
The call flow scenario is as follows:
1. User B enables always call forward, and the destination number is User C.
2. User A calls User B.
3. User B forwards the incoming call to User C.
4. User C answers the call.
Call is established between User A and User C.
User A Proxy Server User B User C
F1. INVITE B
F2. INVITE B
F3. 302 Move Temporarily
F6. ACK
F7. INVITE C
F8. INVITE C
F9. 180 Ringing
F10. 180 Ringing
F11. 200 OK
F12. 200 OK
F13. ACK
F14. ACK
F4. ACK
2-way RTP channel established
F5. 302 Move Temporarily
Step
Action
Description
F1
INVITE—User A to Proxy Server
User A sends an INVITE message to a proxy
server. The INVITE request is an invitation to
User B to participate in a call session.
In the INVITE request:
 The IP address of the User B is
inserted in the Request-URI field.

Yealink SIP-T58V/A Specifications

General

Brand	Yealink
Model	SIP-T58V/A
Category	IP Phone
Language	English