Changes

// Array of all calls that are currently connected.

readonly attribute jsval calls;

readonly attribute nsIDOMTelephonyCallGroup conferanceGroup;

// "disconnected", "incoming", "holding", "held", "resuming"

readonly attribute DOMString state;

readonly attribute nsIDOMTelephonyCallGroup group;

// of this array is never 1.

readonly attribute jsval calls;

// Add a call to the callgroup. call2 must not be specified if the

// callgroup isn't empty.

// Neither call or call2 can be in 'disconnected' state.

void add(nsIDOMTelephonyCall call, optional nsIDOMTelephonyCall call2);

// Removes a call from the callgroup. If this leaves the callgroup with

// just one call, then that last call is also removed from the callgroup.

void remove(nsIDOMTelephonyCall call);

void hold();

// Resuming a group automatically holds any other groups/calls

void resume();

// When this changes, the state of all contained calls changes at the same time

readonly attribute DOMString state;

attribute nsIDOMEventListener onstatechange;