EasyManuals Logo

Yealink SIP-T21 E2 Administrator's Guide

Yealink SIP-T21 E2
1126 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #1107 background imageLoading...
Page #1107 background image
Appendix
1081
Step
Action
Description
User A is identified as the call session
initiator in the From field.
A unique numeric identifier is assigned
to the call and is inserted in the Call-ID
field.
The transaction number within a single
call leg is identified in the CSeq field.
The media capability User A is ready to
receive is specified.
The port on which User B is prepared to
receive the RTP data is specified.
F2
INVITEProxy Server to User B
The proxy server maps the SIP URI in the
To field to User B. The proxy server sends
the INVITE message to User B.
F3
180 RingingUser B to Proxy
Server
User B sends a SIP 180 Ringing response
to the proxy server. The 180 Ringing
response indicates that the user is being
alerted.
F4
180 RingingProxy Server to
User A
The proxy server forwards the 180 Ringing
response to User A. User A hears the ring-
back tone indicating that User B is being
alerted.
F5
200 OKUser B to Proxy Server
User B sends a SIP 200 OK response to the
proxy server. The 200 OK response
notifies User A that the connection has
been made.
F6
200 OKProxy Server to User A
The proxy server forwards the 200 OK
message to User A. The 200 OK response
notifies User A that the connection has
been made.
F7
ACKUser A to Proxy Server
User A sends a SIP ACK to the proxy
server, The ACK confirms that User A has
received the 200 OK response. The call
session is now active.
F8
ACKProxy Server to User B
The proxy server sends the SIP ACK to
User B. The ACK confirms that the proxy
server has received the 200 OK response.
The call session is now active.

Table of Contents

Other manuals for Yealink SIP-T21 E2

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Yealink SIP-T21 E2 and is the answer not in the manual?

Yealink SIP-T21 E2 Specifications

General IconGeneral
BrandYealink
ModelSIP-T21 E2
CategoryIP Phone
LanguageEnglish

Related product manuals