Hello, My sister has direct FTTH with an Analogue Telephone Adapter provided by CommunityFibre.co.uk. She has dynamic IPv4 and dynamic IPv6 addresses. Almost everything works fine except when dialling a telephone number that requires a subsequent button press to select the required service. This always works or always fails, depending on the destination. She has a new Siemens Gigaset C570HX handset, C575A DECT base station, plus a pre-configured Grandstream HT801 Analogue Telephone Adapter (ATA) supplied by CommunityFibre.co.uk. There is a continuous internet data link from the ATA indicated by flashing LED's, but I do not know how the system sends the original DTMF. There is a suggestion that the DTMF might be converted and sent as digital codes by the ATA instead of audio tones, and converted back before being passed on to the current Public Service Telephone Network (Plain Old Telephone System, POTS), and might suffer corruption if the original DTMF is not completely removed first. The Siemens Gigaset equipment probably meets the precise DTMF requirements, but I have no control over the current VOIP system or the destination PABX. We are both long since retired and would prefer not to pay much higher charges for a business class connection, but I may have to choose a different VOIP supplier who can still retain her original telephone number. Any information and suggestions welcome. Thanks. -- Chris Bell Website chrisbell.org.uk
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