Couldn't make calls out as all I got was what I thought was the engaged tone. Logged a fault and after several chats online and on the phone with BT was informed that the fault was repaired but it wasn't so an engineer would be sent. On arriving he immediately informed me that the "engaged tone" is in fact call waiting on digital voice. Once cleared the dial tone was restored. I've never used BT's answer service as like many others I have an answerphone. He advised to set the number rings on my phone to 6 as DV waits for 8. For that 10 minute visit I've been charged £40 for something which wasn't a fault but a service, I neither needed or wanted, foisted on me. None of the operators I spoke to mentioned it was a message waiting tone even whern I played it to one of them on my mobile. I don't recall seeing any warning of this when setting up the digital service and feel this is flaw in the system as it would appear emergency calls out can't be made until the messages have been cleared. Problem solved but at an extortionate cost.
Don’t know why you think if you have a message to listen to on the BT 1571 answer service , that’s included with BTDV , and indicated by the modulated dialtone replacing regular dialtone , that it prevents you making an outgoing call , it doesn’t , you can make outgoing calls regardless of you listening to the message or not , it’s still dialtone, just one that indicates a message waiting .
TBH , although it’s unfortunate, you insisted on a visit when there was nothing wrong apart from a message was left , and although it’s being wise after the event , if you had posted here before asking for a visit , you would have been told to simply call 1571 to listen to the message.
The odd thing is that you say ( but it’s not true ) that it stopped you making a call , it didn’t , it’s easily proved to , leave yourself a message by calling your landline from your mobile , then when you have modulated dialtone replacing regular dialtone , make a call to your mobile, you will find that it’s exactly the same as if regular dialtone was present…obviously you then call 1571 to listen to your message to change dialtone back to normal and don’t answer the outgoing calls to your mobile unless you have inclusive calls ….but the mobile ringing and displaying the landline number is proof that calls can be made with modulated dialtone .
Its odd that technical support did not pick up on the issue however if you were saying that the tone prevented outgoing calls then in the event of no fault being found it sounds like you have booked and agreed to pay for a home technical expert visit which depends on your package can cost £40.00.
If you feel provided what they did and advised for you the visit cost is somehow unfair then speak back with the technical team )As they will have booked this visit) and make a complaint - this can then be looked at and see if anything was missed there end which would have prevented the visit - if so you are likely to get the £40.00 credited back to your bill.