When I worked at an Internet Helpdesk I routinely "downgraded" V90 modems to V34 using AT+MS=V34 or AT+MS=11. Would connect much quicker, more stable and the ef

When I worked at an Internet Helpdesk I routinely "downgraded" V90 modems to V34 using AT+MS=V34 or AT+MS=11. Would connect much quicker, more stable and the effective speed was exactly the same. V90 was really stretching the audible phone spectrum to the max and any type of analog disruption would render it effectively useless.