U.S.Robotics Vi |
These modems only support encapsulated GSM as voice data compression. Make sure that both 'Encapsulated input' and 'Encapsulate output' options are checked in Properties - Modem properties.
Some legacy Vi modems come with a bug in a GSM implementation. They do not provide a correct headers for GSM frames. You should select 'GSM with broken frames' check box in in Properties - Modem properties for such a modem.