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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. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    Request body in a format not supported. [1]: §21.4.13 416 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

  5. Uniform Resource Identifier - Wikipedia

    en.wikipedia.org/wiki/Uniform_Resource_Identifier

    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]

  6. 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 ...

  7. 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.

  8. IP Multimedia Subsystem - Wikipedia

    en.wikipedia.org/wiki/IP_Multimedia_Subsystem

    IP Multimedia Subsystem. The IP Multimedia Subsystem or IP Multimedia Core Network Subsystem (IMS) is a standardised architectural framework for delivering IP multimedia services. Historically, mobile phones have provided voice call services over a circuit-switched -style network, rather than strictly over an IP packet-switched network.

  9. NAPTR record - Wikipedia

    en.wikipedia.org/wiki/NAPTR_record

    The service name E2U+sip is an ENUM string indicating that the record can be used in telephone number-to-SIP-URI queries. [4] The client applies the regular expression !^.*$!sip:customer-service@example.com! , which replaces its entire URI tel:+1-800-555-1234 with sip:customer-service@example.com .