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  2. 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

  3. Session Description Protocol - Wikipedia

    en.wikipedia.org/wiki/Session_Description_Protocol

    The Session Description Protocol describes a session as a group of fields in a text-based format, one field per line. [note 1] The form of each field is as follows. <character>=<value><CR><LF> Where <character> is a single case-sensitive character and <value> is structured text in a format that

  4. Session Initiation Protocol - Wikipedia

    en.wikipedia.org/wiki/Session_Initiation_Protocol

    SIP works in conjunction with several other protocols that specify the media format and coding and that carry the media once the call is set up. For call setup, the body of a SIP message contains a Session Description Protocol (SDP) data unit, which specifies the media format, codec and media communication protocol.

  5. 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 ...

  6. G.729 - Wikipedia

    en.wikipedia.org/wiki/G.729

    G.729a is a compatible extension of G.729, but requires less computational power. This lower complexity, however, bears the cost of marginally reduced speech quality. G.729a was developed by a consortium of organizations: France Télécom, Mitsubishi Electric Corporation, Nippon Telegraph and Telephone Corporation (NTT). The features of G.729a are:

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    Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.

  8. List of FTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_FTP_server_return...

    Requested action not taken. File unavailable (e.g., file not found, no access). 551: Requested action aborted. Page type unknown. 552: Requested file action aborted. Exceeded storage allocation (for current directory or dataset). 553: Requested action not taken. File name not allowed. 600 Series: Replies regarding confidentiality and integrity: 631

  9. SIMPLE (instant messaging protocol) - Wikipedia

    en.wikipedia.org/wiki/SIMPLE_(instant_messaging...

    This provides the actual SIP extensions for subscriptions, notifications and publications. RFC 6665 defines the SUBSCRIBE and NOTIFY methods. SUBSCRIBE allows users to subscribe to an event on a server, the server responds with NOTIFY whenever the event occurs. RFC 3856 defines how to make use of SUBSCRIBE/NOTIFY for presence.