What is the RFC for SIP?

RFC 2543
RFC 2543: SIP: Session Initiation Protocol.

What is based on IETF Session Initiation Protocol?

The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol for creating, modifying and terminating sessions with one or more participants. These sessions include Internet multimedia conferences, Internet telephone calls and multimedia distribution.

What are the mandatory header in SIP?

The Call-ID header field is mandatory in all SIP requests and responses. It is used to uniquely identify a call between two user agents. A Call-ID must be unique across calls. All registrations for a user agent should use the same Call-ID.

What are the key parameters for SIP registration?

Session Initiation Protocol (SIP) Parameters

• Header Fields.
• Reason Protocols.
• Option Tags.
• Warning Codes (warn-codes)
• Methods and Response Codes.
• Response Codes.
• SIP Privacy Header Field Values.
• Security Mechanism Names.

How does a SIP call work?

SIP protocol SIP works by sending messages from one SIP address to another. These messages are typically voice calls. However, SIP also powers messages in the form of video calling and instant messaging. SIP is an over-the-internet exchange of information.

What does SIP stand for?

Session Initiation Protocol
The acronym SIP stands for Session Initiation Protocol and refers to a TCP/IP-based network protocol which can be used to establish and control communication connections of several subscribers. SIP is often used in Voice-over-IP telephony to establish the connection for telephone calls.

Why SIP is used in VoIP?

The Session Initiation Protocol is a signaling protocol that enables the Voice Over Internet Protocol (VoIP) by defining the messages sent between endpoints and managing the actual elements of a call. SIP supports voice calls, video conferencing, instant messaging, and media distribution.

Is contact header mandatory in SIP?

The “Contact” header field provides a single SIP URI that can be used to contact the sender of the INVITE for subsequent requests. The Contact header field MUST be present and contain exactly one SIP URI in any request that can result in the establishment of a dialog – in this case, specifically a SIP INVITE.

What is an SIP invite?

The SIP INVITE is the foundation for every SIP phone call. It is simple and flexible, but often poorly understood by users. The SIP INVITE request is the message sent by the calling party, inviting the recipient for a session. The SIP headers included in this SIP INVITE request provide information about the message.

How does SIP registration work?

It’s as simple as a three step process staring with the User Agent (endpoint) sending a request. Upon receipt the SIP SERVER sends back a challenge and upon receiving back a correct response (valid user ID and password) the SIP SERVER validates the user’s credentials and registers the user in it’s contact database.

What are SIP methods?

What are SIP methods – requests and responses?

• INVITE = Establishes a session.
• ACK = Confirms an INVITE request.
• BYE = Ends a session.
• CANCEL = Cancels establishing of a session.
• REGISTER = Communicates user location (host name, IP).

What is the SIP protocol in RFC 3261?

Discuss this RFC: Send questions or comments to [email protected] This document describes Session Initiation Protocol (SIP), an application-layer control (signaling) protocol for creating, modifying, and terminating sessions with one or more participants.

When was the Session Initiation Protocol ( SIP ) created?

RFC 3261 SIP: Session Initiation Protocol June 2002 Gateway Control Protocol (MEGACO) ( RFC 3015 [ 30 ]) for controlling gateways to the Public Switched Telephone Network (PSTN), and the Session Description Protocol (SDP) ( RFC 2327 [ 1 ]) for describing multimedia sessions.

When is a reliable provisional response required in RFC 3262?

RFC 3262 Reliability of Provisional Responses in SIP June 2002 completion of the call. Similarly, if a reliable provisional response is the first reliable message sent back to the UAC, and the INVITE did not contain an offer, one MUST appear in that reliable provisional response. If the UAC receives a reliable provisional response

How are session descriptions used in IETF Tools?

The usage of session descriptions is described in Section 5 . The reliable provisional response is passed to the transaction layer periodically with an interval that starts at T1 seconds and doubles for each retransmission (T1 is defined in Section 17 of RFC 3261 ).