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/usr/share/javascript/jssip/lib/Constants.js is in libjs-jssip 0.6.34-5.

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The actual contents of the file can be viewed below.

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var pkg = require('../package.json');

var C = {
  USER_AGENT: pkg.title + ' ' + pkg.version,

  // SIP scheme
  SIP:  'sip',
  SIPS: 'sips',

  // End and Failure causes
  causes: {
    // Generic error causes
    CONNECTION_ERROR:         'Connection Error',
    REQUEST_TIMEOUT:          'Request Timeout',
    SIP_FAILURE_CODE:         'SIP Failure Code',
    INTERNAL_ERROR:           'Internal Error',

    // SIP error causes
    BUSY:                     'Busy',
    REJECTED:                 'Rejected',
    REDIRECTED:               'Redirected',
    UNAVAILABLE:              'Unavailable',
    NOT_FOUND:                'Not Found',
    ADDRESS_INCOMPLETE:       'Address Incomplete',
    INCOMPATIBLE_SDP:         'Incompatible SDP',
    MISSING_SDP:              'Missing SDP',
    AUTHENTICATION_ERROR:     'Authentication Error',

    // Session error causes
    BYE:                      'Terminated',
    WEBRTC_ERROR:             'WebRTC Error',
    CANCELED:                 'Canceled',
    NO_ANSWER:                'No Answer',
    EXPIRES:                  'Expires',
    NO_ACK:                   'No ACK',
    DIALOG_ERROR:             'Dialog Error',
    USER_DENIED_MEDIA_ACCESS: 'User Denied Media Access',
    BAD_MEDIA_DESCRIPTION:    'Bad Media Description',
    RTP_TIMEOUT:              'RTP Timeout'
  },

  SIP_ERROR_CAUSES: {
    REDIRECTED: [300,301,302,305,380],
    BUSY: [486,600],
    REJECTED: [403,603],
    NOT_FOUND: [404,604],
    UNAVAILABLE: [480,410,408,430],
    ADDRESS_INCOMPLETE: [484],
    INCOMPATIBLE_SDP: [488,606],
    AUTHENTICATION_ERROR:[401,407]
  },

  // SIP Methods
  ACK:        'ACK',
  BYE:        'BYE',
  CANCEL:     'CANCEL',
  INFO:       'INFO',
  INVITE:     'INVITE',
  MESSAGE:    'MESSAGE',
  NOTIFY:     'NOTIFY',
  OPTIONS:    'OPTIONS',
  REGISTER:   'REGISTER',
  UPDATE:     'UPDATE',
  SUBSCRIBE:  'SUBSCRIBE',

  /* SIP Response Reasons
   * DOC: http://www.iana.org/assignments/sip-parameters
   * Copied from https://github.com/versatica/OverSIP/blob/master/lib/oversip/sip/constants.rb#L7
   */
  REASON_PHRASE: {
    100: 'Trying',
    180: 'Ringing',
    181: 'Call Is Being Forwarded',
    182: 'Queued',
    183: 'Session Progress',
    199: 'Early Dialog Terminated',  // draft-ietf-sipcore-199
    200: 'OK',
    202: 'Accepted',  // RFC 3265
    204: 'No Notification',  //RFC 5839
    300: 'Multiple Choices',
    301: 'Moved Permanently',
    302: 'Moved Temporarily',
    305: 'Use Proxy',
    380: 'Alternative Service',
    400: 'Bad Request',
    401: 'Unauthorized',
    402: 'Payment Required',
    403: 'Forbidden',
    404: 'Not Found',
    405: 'Method Not Allowed',
    406: 'Not Acceptable',
    407: 'Proxy Authentication Required',
    408: 'Request Timeout',
    410: 'Gone',
    412: 'Conditional Request Failed',  // RFC 3903
    413: 'Request Entity Too Large',
    414: 'Request-URI Too Long',
    415: 'Unsupported Media Type',
    416: 'Unsupported URI Scheme',
    417: 'Unknown Resource-Priority',  // RFC 4412
    420: 'Bad Extension',
    421: 'Extension Required',
    422: 'Session Interval Too Small',  // RFC 4028
    423: 'Interval Too Brief',
    428: 'Use Identity Header',  // RFC 4474
    429: 'Provide Referrer Identity',  // RFC 3892
    430: 'Flow Failed',  // RFC 5626
    433: 'Anonymity Disallowed',  // RFC 5079
    436: 'Bad Identity-Info',  // RFC 4474
    437: 'Unsupported Certificate',  // RFC 4744
    438: 'Invalid Identity Header',  // RFC 4744
    439: 'First Hop Lacks Outbound Support',  // RFC 5626
    440: 'Max-Breadth Exceeded',  // RFC 5393
    469: 'Bad Info Package',  // draft-ietf-sipcore-info-events
    470: 'Consent Needed',  // RFC 5360
    478: 'Unresolvable Destination',  // Custom code copied from Kamailio.
    480: 'Temporarily Unavailable',
    481: 'Call/Transaction Does Not Exist',
    482: 'Loop Detected',
    483: 'Too Many Hops',
    484: 'Address Incomplete',
    485: 'Ambiguous',
    486: 'Busy Here',
    487: 'Request Terminated',
    488: 'Not Acceptable Here',
    489: 'Bad Event',  // RFC 3265
    491: 'Request Pending',
    493: 'Undecipherable',
    494: 'Security Agreement Required',  // RFC 3329
    500: 'JsSIP Internal Error',
    501: 'Not Implemented',
    502: 'Bad Gateway',
    503: 'Service Unavailable',
    504: 'Server Time-out',
    505: 'Version Not Supported',
    513: 'Message Too Large',
    580: 'Precondition Failure',  // RFC 3312
    600: 'Busy Everywhere',
    603: 'Decline',
    604: 'Does Not Exist Anywhere',
    606: 'Not Acceptable'
  },

  ALLOWED_METHODS: 'INVITE,ACK,CANCEL,BYE,UPDATE,MESSAGE,OPTIONS',
  ACCEPTED_BODY_TYPES: 'application/sdp, application/dtmf-relay',
  MAX_FORWARDS: 69,
  SESSION_EXPIRES: 90,
  MIN_SESSION_EXPIRES: 60
};


module.exports = C;