drlava

try the voice modem tester link I have above and see if it sounds better.

I think the sound quality issue goes deeper than just choosing the right modem. Voice modems support a few different voice encoding qualities from a few bits 4kHz to 16 bit 8/16 kHz. The modem I have, a Multimodem, supports several different encoding qualities including 4-bit 'rockwell' encoding and 8 bit PCM encoding. The problem is, IVM uses the lowest quality voice encoding this modem has which happens to be default and sounds bad. To test, I installed 'voice modem tester' and PC 2 Answering machine to compare sound quality. These programs use the modem voice mode at the higher datarate/quality and the outgoing and incoming recordings sound natural, verses noisy and mechanical sound through IVM. Also, the data lights blink faster with these other tools as the outgoing buffer is refreshed more often due to the higher datarate of the higher quality outgoing voice stream. So far I have not seen an option in IVM to choose the voice modem CODEC. I think this option would vastly improve its quality with a number of modems available.