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This way, other proxy servers that receive this SIP request within the Trust Domain (i.e. the network of trusted entities with previously agreed security policies) can safely rely on the identity information carried in the P-Asserted-Identity header without the necessity of re-authenticating the user.
Extended search being performed may take a significant time so a forking proxy must send a 100 Trying response. [1]: §21.1.1 180 Ringing Destination user agent received INVITE, and is alerting user of call. [1]: §21.1.2 181 Call is Being Forwarded Servers can optionally send this response to indicate a call is being forwarded.
SIP Mw P-CSCF, I-CSCF, S-CSCF, AGCF Used to exchange messages between CSCFs. AGCF appears as a P-CSCF to the other CSCFs SIP Mx BGCF/CSCF, IBCF Used for the interworking with another IMS network, when the BGCF has determined that a breakout should occur in the other IMS network to send SIP message from BGCF to the IBCF in the other network SIP P1
SIMPLE applies SIP to the problems of: registering for presence information and receiving notifications when such events occur, for example when a user logs in or comes back from lunch; sending short messages, analogous to SMS or two-way paging; managing a session of real-time messages between two or more participants.
SIP is a text-based protocol, incorporating many elements of the Hypertext Transfer Protocol (HTTP) and the Simple Mail Transfer Protocol (SMTP). [3] A call established with SIP may consist of multiple media streams, but no separate streams are required for applications, such as text messaging, that exchange data as payload in the SIP message.
Authenticated Identity Body or AIB is a method allowing parties in a network to share authenticated identity, thereby increasing the integrity of their SIP communications. AIBs extend other authentication methods like S/MIME to provide a more specific mechanism to introduce integrity to SIP transmissions.
SIP trunking is a voice over Internet Protocol (VoIP) technology and streaming media service based on the Session Initiation Protocol (SIP) by which Internet telephony service providers (ITSPs) deliver telephone services and unified communications to customers equipped with SIP-based private branch exchange (IP-PBX) and unified communications facilities. [1]
The SIP URI scheme is a Uniform Resource Identifier (URI) scheme for the Session Initiation Protocol (SIP) multimedia communications protocol. A SIP address is a URI that addresses a specific telephone extension on a voice over IP system. Such a number could be a private branch exchange or an E.164 telephone number dialled through a specific ...