Specifications

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
No
606 Not Acceptable
No
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