
PASS insertDTMF() should succeed if tones contains valid DTMF characters 
PASS insertDTMF() should throw InvalidCharacterError if tones contains invalid DTMF characters 
PASS insertDTMF() should throw InvalidStateError if transceiver is stopped 
PASS insertDTMF() should throw InvalidStateError if transceiver.currentDirection is recvonly 
PASS insertDTMF() should throw InvalidStateError if transceiver.currentDirection is inactive 
PASS insertDTMF() should set toneBuffer to provided tones normalized, with old tones overridden 
PASS insertDTMF() after remove and close should reject