Yealink SIP-T38G Administrator's Guide

Administrator’s Guide for SIP-T3xG IP Phones
356
Step
Action
Description
F13
INVITE—User A to Proxy
Server
User A sends a mid-call INVITE request
to the proxy server with new SDP
session parameters, which are used to
place the call on hold.
F14
INVITE—Proxy Server to User
B
The proxy server forwards the mid-call
INVITE message to User B.
F15
200 OK—User B to Proxy
Server
User B sends a 200 OK to the proxy
server. The 200 OK response indicates
that the INVITE was successfully
processed.
F16
200 OK—Proxy Server to User
A
The proxy server forwards the 200 OK
response to User A. The 200 OK
response notifies User B is successfully
put on hold.
F17
ACK—User A to Proxy Server
User A sends an ACK message to the
proxy server. The ACK confirms that
User A has received the 200 OK
response. The call session is now
temporarily inactive. No RTP packets
are being sent.
F18
ACK—Proxy Server to User B
The proxy server sends the ACK
message to User B. The ACK confirms
that the proxy server has received the
200 OK response.
F19
200 OK—User A to Proxy
Server
User A sends a 200 OK response to the
proxy server. The 200 OK response
notifies that the connection has been
made.
F20
200 OK—Proxy Server User C
The proxy server forwards the 200 OK
message to User C.
F21
ACK—User C to Proxy Server
User C sends a SIP ACK to the proxy
server. The ACK confirms that User C
has received the 200 OK response. The
call session is now active.
F22
ACK—Proxy Server to User A
The proxy server forwards the SIP ACK
to User A to confirm that User C has
received the 200 OK response.

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