SIP (Session Initiation Protocol)

Session Initiation Protocol (SIP) is a signaling protocol for controlling multi-media sessions. In other words, it provides a way to establish voice, video and messaging communication between devices. From its initial use in Internet Telephony, SIP is spreading into many new areas, including advanced telephony applications, conferencing and instant messaging, and its functionality is expanding to meet the new requirements from its increased scope.

SIP Features

Features of SIP VoIP include the possibility for users to start and receive communications and services from any phone location and for networks to identify the users wherever they may be.

SIP analyzes requests from clients and retrieves responses from servers. Interlocutors are identified by SIP URLs. SIP decides the end system to be used for the session, the communication media and media parameters, as well as the called party's desire to take part in the communication. SIP then sets call parameters at either end of the phone communication, handles call transfer and termination. A great feature of SIP is that it offers the possibility for users to start and receive communications and services from any location and for networks to identify the users wherever they may be.

SIP is an alternative protocol to H.323

SIP is an alternative protocol to H.323 - the IP videoconference transmissions protocol that has been in use since its approval in 1996. Up until now, H.323 has been the VoIP industry standard, but its leadership has been questioned by the wide implementation of SIP in the past year(s).

Multicast conference and media integration

SIP also provides you with the possibility of adding participants to an already existing session, such as a multicast conference. Also, media can be added to (and removed from) an existing session.

SIP supports personal mobility

SIP supports name mapping and redirection services, which support personal mobility - users can maintain a single externally visible identifier regardless of their network location.

In order to safely and reliably establish and terminate multimedia communications,

SIP supports five facets:

user location (for deciding which end system is to be used for the communication);
user availability (for determining whether the called party is willing to engage in communication);
user capabilities (for determining the media and media parameters that are to be used in the communication);
session setup ("ringing", for establishing the communication session parameters at both ends) and session management (that includes data packets transfer and termination of sessions,
modifying session parameters, and invoking services).

SIP PDF Information:

If you would like more SIP information, feel free to download the SIP pdf file.

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