Yealink CP860 [376/417] Sip session description protocol sdp usage

Administrator’s Guide for CP860 IP conference phones

364

6xx Response—Global Responses

6xx Response

Supported

Notes

600 Busy Everywhere

Yes

603 Decline

Yes

604 Does Not Exist Anywhere

606 Not Acceptable

SDP Headers

Supported

v—Protocol version

Yes

o—Owner/creator and session

identifier

Yes

a—Media attribute

Yes

c—Connection information

Yes

m—Media name and transport

address

Yes

s—Session name

Yes

t—Active time

Yes

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