Sip Session Description Protocol (Sdp) Usage; Appendix E: Sip Call Flows; Successful Call Setup And Disconnect - Yealink T46G Administrator's Manual

Yealink Skype for Business HD IP Phones Administrator Guide

SIP Session Description Protocol (SDP) Usage

SDP Headers
v—Protocol version
o—Owner/creator and session identifier
a—Media attribute
c—Connection information
m—Media name and transport address
s—Session name
t—Active time

Appendix E: SIP Call Flows

SIP uses six request methods:
INVITE—Indicates a user is being invited to participate in a call session.
ACK—Confirms that the client has received a final response to an INVITE request.
BYE—Terminates a call and can be sent by either the caller or the callee.
CANCEL—Cancels any pending searches but does not terminate a call that has already been
accepted.
OPTIONS—Queries the capabilities of servers.
REGISTER—Registers the address listed in the To header field with a SIP server.
The following types of responses are used by SIP and generated by the Skype for Business
phone or the SIP server:
SIP 1xx—Informational Responses
SIP 2xx—Successful Responses
SIP 3xx—Redirection Responses
SIP 4xx—Client Failure Responses
SIP 5xx—Server Failure Responses
SIP 6xx—Global Failure Responses

Successful Call Setup and Disconnect

The following figure illustrates the scenario of a successful call. In this scenario, the two end
users are User A and User B. User A and User B are located at Yealink Skype for Business phones.
378
Supported
Yes
Yes
Yes
Yes
Yes
Yes
Yes