Alternative to BT Business BBV

[GaryD]

Hello Everyone,
I am just about to give up on BT's Business Broadband Voice Service and I am posting this to the forum to see what advice you can provide. First - the problem... I have subscribed to BT Business Broadband and they have supplied their BT 2700HGV "2 wire" router. I have had problems with the Broadband Voice line since installation e.g. intermittent unacceptable echo/delay in one direction or the other and sometimes "incorrect number dialled message" breaking in before entire number has been dialled. I have made many calls to their broadband & VOIP support teams. The router has been replaced, as has the phone. The broadband line quality is good with bandwidth of 7Mbs+ and I have no issues with the data service. There is only one computer and one user of the line. They now tell me that everything that can be done to improve the VOIP line has been done and that the problems must be due to other (unspecified) problems in my home/office environment. I still want to use and take advantage of VOIP but I am not sure who/what to try next. Can anyone advise me?