Yealink SIP-T38G Administrator's Guide

Appendix
353
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 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-T38G Specifications

General

Expansion module support	Yes
Ethernet LAN (RJ-45) ports	2
Keypad number of keys	48
Touchscreen	-
Display resolution	480 x 272 pixels
Display number of colors	16.78 million colors
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	6
Voice codecs	G.711, G.722, G.723.1, G.726
Bluetooth	No
Security algorithms	802.1x RADIUS, HTTPS, SSL/TLS
AC adapter input voltage	100 - 240 V
AC adapter output voltage	5 V
Power consumption (typical)	4.6 W
Operating relative humidity (H-H)	10 - 95 %
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Compliance industry standards	IEEE 802.3af
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	204 mm
Width	273 mm
Height	42 mm
Weight	1050 g