My point exactly Clubman.
My situation is that I call analogue lines in the UK etc and have dropout with an Eircom landline and the NTL equivalent version of a landline isn't worked the same way as it goes via cable.
Is there a good chance of more increased problems on the NTL line worked in conjunction with 13434 , especially when calling analogue lines overseas???
Yes - but then 13434 route the call onto the ultimate destination themselves so that would be relevant to the sound quality between the endpoints.