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  2. SIP URI scheme - Wikipedia

    en.wikipedia.org/wiki/SIP_URI_scheme

    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 ...

  3. Session Initiation Protocol - Wikipedia

    en.wikipedia.org/wiki/Session_Initiation_Protocol

    v. t. e. The Session Initiation Protocol (SIP) is a signaling protocol used for initiating, maintaining, and terminating communication sessions that include voice, video and messaging applications. [1] SIP is used in Internet telephony, in private IP telephone systems, as well as mobile phone calling over LTE (VoLTE).

  4. Telephone number mapping - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_mapping

    Telephone number mapping systems provide facilities to determine applicable Internet communications servers responsible for servicing a given telephone number using DNS queries. The most prominent facility for telephone number mapping is the E.164 number to URI mapping (ENUM) standard. It uses special DNS record types to translate a telephone ...

  5. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    416 Unsupported URI Scheme Request-URI is unknown to the server. [1]: §21.4.14 417 Unknown Resource-Priority There was a resource-priority option tag, but no Resource-Priority header. [10] 420 Bad Extension Bad SIP Protocol Extension used, not understood by the server. [1]: §21.4.15 421 Extension Required

  6. SIPRNet - Wikipedia

    en.wikipedia.org/wiki/SIPRNet

    Header of an unclassified Department of State telegram with the "SIPDIS" tag marked in red. The Secret Internet Protocol Router Network (SIPRNet) is "a system of interconnected computer networks used by the U.S. Department of Defense and the U.S. Department of State to transmit classified information (up to and including information classified SECRET) by packet switching over the 'completely ...

  7. Uniform Resource Identifier - Wikipedia

    en.wikipedia.org/wiki/Uniform_Resource_Identifier

    A Uniform Resource Identifier (URI), formerly Universal Resource Identifier, is a unique sequence of characters that identifies an abstract or physical resource, [1] such as resources on a webpage, mail address, phone number, [2] books, real-world objects such as people and places, concepts. [3] URIs are used to identify anything described ...

  8. List of URI schemes - Wikipedia

    en.wikipedia.org/wiki/List_of_URI_schemes

    file - File URI scheme. ftp – File Transfer Protocol. http – Hypertext Transfer Protocol. https – Hypertext Transfer Protocol Secure. imap – Internet Message Access Protocol. irc – Internet Relay Chat. nntp – Network News Transfer Protocol. as well as many lesser known schemes like: acap – Application Configuration Access Protocol.

  9. Federal government of the United States - Wikipedia

    en.wikipedia.org/wiki/Federal_Government_of_the...

    The federal government of the United States (U.S. federal government or U.S. government) [a] is the national government of the United States, a federal republic located primarily in North America, composed of 50 states, five major self-governing territories, several island possessions, and the federal district (national capital) of Washington ...