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SIP Messages and Response codes

Posted by on 09 December 2011 01:45 AM

The Session Initiation Protocol (SIP) is a text based protocol used by ESI Hosted Services to manage call flows and provide telephony service over the internet. SIP is an RFC2833 text message standard; SIP messaging is structured in the format of messages from servers and responses from clients.

There are several basic message types used for controlling calls:

Type	Message	Action or Indication
Request	INVITE	Invites a user or service 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 called party
	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

These messages are one-half of the client-server communication format of SIP messages. There are also response codes sent as replies to the messages; here is a general outline of SIP response codes:

Type	Message	Action or Indication
Response	SIP 1xx	Informational
	SIP 2xx	Successful
	SIP 3xx	Redirection
	SIP 4xx	Client Failure
	SIP 5xx	Server Error
	SIP 6xx	Global failure

For more information on SIP messages and call flows, please see our documentation source: Cisco SIP Proxy Server Version 2.2 Administrator Guide
For more information on SIP response codes please see: List of SIP response codes

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