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 ## API
 
 The entrypoint to the library is the `sylkrtc` object. Several objects (`Connection`, `Account` and `Call`) inherit from Node's `EventEmitter` class, you may want to check [its documentation](https://nodejs.org/api/events.html).
 
 
 ### sylkrtc
 
 The main entrypoint to the library. It exposes the main function to connect to SylkServer and some utility functions for general use.
 
 
 #### sylkrtc.createConnection(options={})
 
 Creates a `sylkrtc` connection towards a SylkServer instance. The only supported option (at the moment) is "server", which should point to the WebSocket endpoint of the WebRTC gateway application. Example: `wss://1.2.3.4:8088/webrtcgateway/ws`.
 
 It returns a `Connection` object.
 
 Example:
 
     let connection = sylkrtc.createConnection({server: 'wss://1.2.3.4:8088/webrtcgateway/ws'});
 
 
 #### sylkrtc.utils
 
 Helper module with utility functions.
 
 * `attachMediaStream`: function to easily attach a media stream to an element. It reexports [attachmediastream](https://github.com/otalk/attachMediaStream).
 * `closeMediaStream`: function to close the given media stream.
 
 ### Connection
 
 Object representing the interaction with SylkServer. Multiple connections can be created with
 `sylkrtc.createConnection`, but typically only one is needed. Reconnecting in case the connection is interrupted is
 taken care of automatically.
 
 Events emitted:
 * **stateChanged**: indicates the WebSocket connection state has changed. Two arguments are provided: `oldState` and
   `newState`, the old connection state and the new connection state, respectively. Possible state values are: null,
   connecting, connected, ready, disconnected and closed. If the connection is involuntarily interrupted the state will
   transition to disconnected and the connection will be retried. Once the closed state is set, as a result of the user
   calling Connection.close(), the connection can no longer be used or reconnected.
 
 
 #### Connection.addAccount(options={}, cb=null)
 
 Configures an `Account` to be used through `sylkrtc`.  2 options are required: *account* (the account ID) and
 *password*. An optional *displayName* can be set. The account won't be registered, it will just be created.
 Optionally *realm* can be passed, which will be used instead of the domain for the HA1 calculation.
 
 The *password* won't be stored or transmitted as given, the HA1 hash (as used in
 [Digest access authentication](https://en.wikipedia.org/wiki/Digest_access_authentication)) is created and used instead.
 
 The `cb` argument is a callback which will be called with an error and the account object
 itself.
 
 Example:
 
     connection.addAccount({account: saghul@sip2sip.info, password: 1234}, function(error, account) {
         if (error) {
             console.log('Error adding account!' + account);
         } else {
             console.log('Account added!');
         }
     });
 
 
 #### Connection.removeAccount(account, cb=null)
 
 Removes the given account. The callback will be called once the operation completes (it
 cannot fail). The callback will be called with an error object.
 
 Example:
 
     connection.removeAccount(account, function(error) {
         console('Account removed!');
     });
 
 
 #### Connection.reconnect()
 
 Starts reconnecting immediately if the state was 'disconnected';
 
 
 #### Connection.close()
 
 Close the connection with SylkServer. All accounts will be unbound.
 
 
 #### Connection.state
 
 Getter property returning the current connection state.
 
 
 ### Account
 
 Object representing a SIP account which will be used for making / receiving calls.
 
 Events emitted:
 * **registrationStateChanged**: indicates the SIP registration state has changed. Three arguments are provided:
   `oldState`, `newState` and `data`. `oldState` and `newState` represent the old registration state and the new
   registration state, respectively, and `data` is a generic per-state data object. Possible states:
    * null: registration hasn't started or it has ended
    * registering: registration is in progress
    * registered
    * failed: registration failed, the `data` object will contain a 'reason' property.
 * **outgoingCall**: emitted when an outgoing call is made. A single argument is provided: the `Call` object.
 * **incomingCall**: emitted when an incoming call is received. Two arguments are provided: the `Call` object and a
   `mediaTypes` object, which has 2 boolean properties: `audio` and `video`, indicating if those media types were
   present in the initial SDP.
 * **missedCall**: emitted when an incoming call is missed. A `data` object is provided, which contains an `originator`
   attribute, which is an `Identity` object.
 * **conferenceInvite**: emitted when someone invites us to join a conference. A `data` object is provided, which contains
   an `originator` attribute indicating who invited us, and a `room` attribute indicating what conference we have been invited to.
 
 
 #### Account.register()
 
 Start the SIP registration process for the account. Progress will be reported via the
 *registrationStateChanged* event.
 
 Note: it's not necessary to be registered to make an outgoing call.
 
 
 #### Account.unregister()
 
 Unregister the account. Progress will be reported via the
 *registrationStateChanged* event.
 
 
 #### Account.call(uri, options={})
 
 Start an outgoing call. Supported options:
 * pcConfig: configuration options for `RTCPeerConnection`. [Reference](http://w3c.github.io/webrtc-pc/#configuration).
 * offerOptions: `RTCOfferOptions`. [Reference](http://w3c.github.io/webrtc-pc/#idl-def-RTCOfferOptions).
 * localStream: user provided local media stream (acquired with `getUserMedia` TODO).
 
 Example:
 
     const call = account.call('3333@sip2sip.info', {localStream: stream});
 
 
 #### Account.joinConference(uri, options={})
 
 Join (or create in case it doesn't exist) a multi-party video conference at the given URI. Supported options:
 
 * pcConfig: configuration options for `RTCPeerConnection`. [Reference](http://w3c.github.io/webrtc-pc/#configuration).
 * offerOptions: `RTCOfferOptions`. [Reference](http://w3c.github.io/webrtc-pc/#idl-def-RTCOfferOptions).
 * localStream: user provided local media stream (acquired with `getUserMedia` TODO).
 
 Example:
 
     const conf = account.joinConference('test123@conference.sip2sip.info', {localStream: stream});
 
 
 #### Account.id
 
 Getter property returning the account ID.
 
 
 #### Account.displayName
 
 Getter property returning the account display name.
 
 
 #### Account.password
 
 Getter property returning the HA1 password for the account.
 
 
 #### Account.registrationState
 
 Getter property returning the current registration state.
 
 
-#### Account.setDeviceToken(oldToken, newTokenn)
+#### Account.setDeviceToken(oldToken, newToken)
 
 Set the current device token for this account.  The device token is an opaque string usually provided by the Firebase SDK
 which SylkServer can use to send push notifications.
 
 ### Call
 
 Object representing a audio/video call. Signalling is done using SIP underneath.
 
 Events emitted:
 * **localStreamAdded**: emitted when the local stream is added to the call. A single argument is provided: the stream itself.
 * **streamAdded**: emitted when a remote stream is added to the call. A single argument is provided: the stream itself.
 * **stateChanged**: indicates the call state has changed. Three arguments are provided: `oldState`, `newState` and
   `data`. `oldState` and `newState` indicate the previous and current state respectively, and `data` is a generic
   per-state data object. Possible states:
     * terminated: the call has ended (the `data` object contains a `reason` attribute)
     * accepted: the call has been accepted (either locally or remotely)
     * incoming: initial state for incoming calls
     * progress: initial state for outgoing calls
     * established: call media has been established
 * **dtmfToneSent**: emitted when one of the tones passed to `sendDtmf` is actually sent. An empty tone indicates all tones have
   finished playing.
 
 
 #### Call.answer(options={})
 
 Answer an incoming call. Supported options:
 * pcConfig: configuration options for `RTCPeerConnection`. [Reference](http://w3c.github.io/webrtc-pc/#configuration).
 * answerOptions: `RTCAnswerOptions`. [Reference](http://w3c.github.io/webrtc-pc/#idl-def-RTCAnswerOptions).
 * localStream: user provided local media stream (acquired with `getUserMedia` TODO).
 
 
 #### Call.terminate()
 
 End the call.
 
 
 #### Call.getLocalStreams()
 
 Returns an array of *local* `RTCMediaStream` objects.
 
 
 #### Call.getRemoteStreams()
 
 Returns an array of *remote* `RTCMediaStream` objects.
 
 
 #### Call.sendDtmf(tones, duration=100, interToneGap=70)
 
 Sends the given DTMF tones over the active audio stream track.
 
 **Note**: This feature requires browser support for `RTCPeerConnection.createDTMFSender`.
 
 
 #### Call.account
 
 Getter property which returns the `Account` object associated with this call.
 
 
 #### Call.id
 
 Getter property which returns the ID for this call. Note: this is not related to the SIP Call-ID header.
 
 
 #### Call.direction
 
 Getter property which returns the call direction: "incoming" or "outgoing". Note: this is not related to the SDP
 "a=" direction attribute.
 
 
 #### Call.state
 
 Getter property which returns the call state.
 
 
 #### Call.localIdentity
 
 Getter property which returns the local identity. (See the `Identity` object).
 
 
 #### Call.remoteIdentity
 
 Getter property which returns the remote identity. (See the `Identity` object).
 
 
 ### Conference
 
 Object representing a multi-party audio/video conference.
 
 Events emitted:
 
 * **localStreamAdded**: emitted when the local stream is added to the call. A single argument is provided: the stream itself.
 * **stateChanged**: indicates the conference state has changed. Three arguments are provided: `oldState`, `newState` and
   `data`. `oldState` and `newState` indicate the previous and current state respectively, and `data` is a generic
   per-state data object. Possible states:
     * terminated: the conference has ended
     * accepted: the initial offer has been accepted
     * progress: initial state
     * established: conference has been established and media is flowing
 * **participantJoined**: emitted when a participant joined the conference. A single argument is provided: an instance of
   `Participant`. Note that this event is only emitted when new participants join, `Conference.participants` should be checked
   upon the initial join to check what participants are already in the conference.
 * **participantLeft**: emitted when a participant leaves the conference. A single argument is provided: an instance of
   `Participant`.
 
 #### Conference.getLocalStreams()
 
 Returns an array of *local* `RTCMediaStream` objects. These are the streams being published to the conference.
 
 
 #### Conference.getRemoteStreams()
 
 Returns an array of *remote* `RTCMediaStream` objects. These are the streams published by all other participants in the conference.
 
 
 #### Conference.scaleLocalTrack(track, divider)
 
 Scale the given local video track by a given divider. Currently this function will not work, since browser support is lacking.
 
 
 #### Conference.participants
 
 Getter property which returns an array of `Participant` objects in the conference.
 
 
 #### Conference.account
 
 Getter property which returns the `Account` object associated with this conference.
 
 
 #### Conference.id
 
 Getter property which returns the ID for this conference. Note: this is not related to the URI.
 
 
 #### Conference.direction
 
 Dummy property always returning "outgoing", in order to provide the same API as `Call`.
 
 
 #### Conference.state
 
 Getter property which returns the conference state.
 
 
 #### Conference.localIdentity
 
 Getter property which returns the local identity. (See the `Identity` object). This will always be built from the account.
 
 
 #### Conference.remoteIdentity
 
 Getter property which returns the remote identity. (See the `Identity` object). This will always be built from the remote URI.
 
 
 ### Participant
 
 Object representing another user connected to the same conference.
 
 Events emitted:
 
 * **streamAdded**: emitted when a remote stream is added. A single argument is provided: the stream itself.
 * **stateChanged**: indicates the participant state has changed. Three arguments are provided: `oldState`, `newState` and
   `data`. `oldState` and `newState` indicate the previous and current state respectively, and `data` is a generic
   per-state data object. Possible states:
     * null: initial state
     * progress: the participant is being attached to, this will happen as a result to `Participant.attach`
     * established: media is flowing from this participant
 
 
 #### Participant.id
 
 Getter property which returns the ID for this participant. Note this an abstract ID.
 
 
 #### Participant.state
 
 Getter property which returns the participant state.
 
 
 #### Participant.identity
 
 Getter property which returns the participant's identity. (See the `Identity` object).
 
 
 #### Participant.publisherId
 
 Getter property which returns the participant's publisher session id.
 
 
 #### Participant.streams
 
 Getter property which returns the audio / video streams for this participant.
 
 
 #### Participant.videoPaused
 
 Getter property which returns true / false when the video subscription is paused / not paused
 
 
 #### Participant.attach()
 
 Start receiving audio / video from this participant. Once attached the participant's state will switch to 'established'
 and its audio /video stream(s) will be available in `Participant.streams`. If a participant is not attached to, no
 audio or video will be received from them.
 
 
 #### Participant.detach()
 
 Stop receiving audio / video from this participant. The opposite of `Participant.attach()`.
 
 
 #### Participant.pauseVideo()
 
 Stop receiving video from this participant. The opposite of `Participant.resumeVideo()`.
 
 
 #### Participant.resumeVideo()
 
 Resume receiving video from this participant. The opposite of `Participant.pauseVideo()`.
 
 
 ### Identity
 
 Object representing the identity of the caller / callee.
 
 
 #### Identity.uri
 
 SIP URI, without the 'sip:' prefix.
 
 
 #### Identity.displayName
 
 Display name assiciated with the identity. Set to '' if absent.
 
 
 #### Identity.toString()
 
 Function returning a string representation of the identity. It can take 2 forms
 depending on the availability of the display name: 'bob@biloxi.com' or
 'Bob <bob@biloxi.com>'.