What is media negotiation in SIP?

As the type of media session and codec to be used are part of the connection negotiation, SIP can use SDP to specify multiple alternative media types and to selectively accept or decline those media types.

What is payload in SIP?

Payload data is referring to the body of the SIP request or response. It is completely arbitrary and can consist of anything. It’s similar to the body of an HTTP request. The most common payload you will see on SIP messages are Session Description Protocol (SDP) offers and answers.

What is AVP in SIP?

The SIP-Authorization AVP contains specific parts of the data portion of the Authorization or Proxy-Authorization SIP headers suitable for inclusion in a SIP request. The identification and encoding of the specific parts are defined in 3GPP TS 29.228.

What is SDP offer?

In SDP, a media stream is described by an “m=” line and its associated attributes. Offer: An SDP message sent by an offerer. Offerer: An agent which generates a session description in order to create or modify a session.

What is Mar in IMS?

Core Session Manager Essentials Guide It requests these from a server, usually the HSS, by sending it a Multimedia Auth Request (MAR) message. The MAR’s AVPs are populated with: Public-User-Identity—the SIP AOR of the endpoint being registered (same as UAR)

What is AVP Kamailio?

The AVPs are variables attached to the SIP message being processed. Each variable has its name and value. AVPs can be used to store arbitrary data or as a means of inter-module communication.

Who invented SIP?

SIP was originally designed by Mark Handley, Henning Schulzrinne, Eve Schooler and Jonathan Rosenberg in 1996 to facilitate establishing multicast multimedia sessions on the Mbone. The protocol was standardized as RFC 2543 in 1999.

What is early offer in SIP?

The difference between Early Offer and Late Offer is in which SIP Message the SDP is sent. In an Early Offer call, the SDP message is sent by the calling endpoint in the initial invite message. The receiving endpoint sends their SDP in the 200 OK message sent when the call is answered.

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