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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. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    The original Request-URI is no longer valid, the new address is given in the Contact header field, and the client should update any records of the original Request-URI with the new value. [1]: §21.3.2 302 Moved Temporarily The client should try at the address in the Contact field.

  4. Session Initiation Protocol - Wikipedia

    en.wikipedia.org/wiki/Session_Initiation_Protocol

    The URI scheme used for SIP is sip and a typical SIP URI has the form sip:username@domainname or sip:username@hostport, where domainname requires DNS SRV records to locate the servers for SIP domain while hostport can be an IP address or a fully qualified domain name of the host and port.

  5. Telephone number mapping - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_mapping

    A personal Uniform Resource Identifier (URI) to be used on the IP part of the network, as explained below. One E.164 regular personal telephone number associated with the personal URI, to be used on the PSTN part of the network. Authority to write their call forwarding/termination preferences in the NAPTR record accessible via the personal URI.

  6. SIP extensions for the IP Multimedia Subsystem - Wikipedia

    en.wikipedia.org/wiki/SIP_extensions_for_the_IP...

    These two extensions allow users to specify their preferences about the service the IMS provides. With the caller preferences extension, [8] the calling party is able to indicate the kind of user agent they want to reach (e.g. whether it is fixed or mobile, a voicemail or a human, personal or for business, which services it is capable to provide, or which methods it supports) and how to search ...

  7. 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 .

  8. IP Multimedia Subsystem - Wikipedia

    en.wikipedia.org/wiki/IP_Multimedia_Subsystem

    VoIP gateway link to IMS using SIP over Gm reference point. The conversion from POTS service over the z interface to SIP occurs in the customer premises VoIP gateway. POTS signaling is converted to SIP and passed on to P-CSCF. VGW acts as SIP user agent and appears to P-CSCF as SIP terminal. Both A-MGW and VGW are unaware of the services.

  9. List of URI schemes - Wikipedia

    en.wikipedia.org/wiki/List_of_URI_schemes

    A Uniform Resource Identifier helps identify a source without ambiguity. Many URI schemes are registered with the IANA; however, there exist many unofficial URI schemes as well. Mobile deep links are one example of a class of unofficial URI schemes that allow for linking directly to a specific location in a mobile app.