Yealink SIP-T48G Administrator's Guide

Appendix
849
The call flow scenario is as follows:
1. User A calls User B.
2. User B answers the call.
3. User C calls User B.
4. User B accepts the call from User C.
F9. INVITE A
F11. 180 Ringing
F20. 200 OK
F1. INVITE B
F3. 180 Ringing
F5. 200 OK
F7. ACK
User A User B
User CProxy Server
F2. INVITE B
F4. 180 Ringing
F6. 200 OK
F8. ACK
F10. INVITE A
F12. 180 Ringing
F13. INVITE B ( sendonly )
F15. 200 OK
F316 200 OK
F17. ACK
F18. ACK
F19. 200 OK
F21. ACK
F22. ACK
F14. INVITE B ( sendonly )
2-way RTP channel established
No RTP Packets being sent
2-way RTP channel established

Yealink SIP-T48G Specifications

General

Expansion module support	Yes
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Volume control	-
Display diagonal	7 \
Display resolution	800 x 480 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	6
AC adapter input voltage	100 - 240 V
Number of handles included	1 pc(s)

Weight and Dimensions

Width	266 mm
Height	185 mm