Yealink SIP-T2XP Administrator's Manual page 446

Administrator's Guide for SIP-T2xP and SIP-T19P IP Phones
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
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 IP 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

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Supported
Yes
Yes
Yes
Yes
Yes
Yes
Yes