A message left on 1571 doesn’t stop an outgoing call ,that’s nonsense, however if you were advised that DV was ‘live’ and you tried to use the phone still connected to the master socket, rather than moving the phone into socket to the socket on the router , then obviously you won’t be able to make a call on the old network if it’s been ‘turned off’ in favour of DV ….TBH , the instructions are pretty clear , and the majority have no problem at all following them .
If this is an issue as you claim , is it still the same now ? , with you being unable to make an outgoing call if a message is left , or are you claiming it was a one off , that you listened to that original message (once you knew modulated dialtone is just dialtone with an indicator of a message , which you then listened to )
Try leaving yourself another message and see if this ‘fault’ returns, then report the problem, however no one on here has seen such a fault report previously.
….the other possibility is your phone is set to loop dial not DTMF ( touch tone ) , DV won’t respond to loop disconnect pulses only DTMF , but if that was the case you couldn’t have listened to your message to get ‘normal’ dialtone back .
