Customer recently switched phone carriers to one which provides a gateway for over the internet.They have noticed an initial delay when they make a call, but no lag while they talk. Remote access to the voice mail is hampered, takes several tries for system to hear the " mbox # " then "password # " combination when trying to login. Seems to hear the *7 combo, and once your in, the other "tones" seem to work fine. Carrier is suggesting adjusting the DTMF to local, but I'm not aware of how you would do this on the Partner ACS r7. This is really more of an issue from a Cell phone connection, land line seems to work better, but still not as reliable as before the change.