This API is available on Firefox OS for internal applications only.
onvoicechange property specifies an event listener to receive
voicechange events. These events occur whenever the
MozMobileConnection.voice connection object changes.
MozMobileConnection inherits from the
EventTarget interface, so it's also possible to listen for events by using the
navigator.mozMobileConnection.onvoicechange = funcRef;
funcRef is a function to be called when the
voicechange event occurs.
Not part of any specification.
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