In order to change the speaker control for your modem, go to Home|Network|Interfaces and then click the Edit pencil on the row for your TTY
device. From the point-to-point configuration screen, click SELECT. From the
Modem Selection page, click the Edit pencil associated with your modem
configuration. Select the INITIALIZATION tab. Click the Edit pencil to edit
the initialization string under "AT Command Strings". Now, the standard for
speaker control in the AT command set is the "M" parameter. You probably have
an "M2" in your init string; change this to "M0" (em zero). This completely
disables the speaker. Some modem manufacturers support a volume AT command,
but you will have to check your owner's manual to see if this particular
feature is support by your modem. Click STORE. Make sure your modem is still
selected and click SELECT. Click STORE again. Now COMMIT/Commit and your ppp
configurations will be rewritten to reflect the change in your modem
configuration.
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