Via: SIP/2.0/TLS :5061 branch = z9hG4bK74bf9Īllow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Sip definition telecoms code#
The following code shows how INVITE is used. Re-INVITE is used to change the session characteristics or refresh the state of a dialog. INVITE can contain the media information of the caller in the message body.Ī session is considered established if an INVITE has received a success response(2xx) or an ACK has been sent.Ī successful INVITE request establishes a dialog between the two user agents which continues until a BYE is sent to terminate the session.Īn INVITE sent within an established dialog is known as a re-INVITE. In other words, an INVITE method is used to establish a media session between the user agents. INVITE is used to initiate a session with a user agent.
There are six core methods as discussed below. METHODS are distinguished into two types − METHODS can be regarded as SIP requests, since they request a specific action to be taken by another user agent or server. These SIP requests which are known as METHODS make SIP message workable. To complement them, there are SIP responses that generally indicate whether a request succeeded or failed. SIP requests are the codes used to establish a communication. Similarly, the opening line of a response contains a response code. The opening line of a request contains a method that defines the request, and a Request-URI that defines where the request is to be sent. SIP messages are of two types − requests and responses.
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