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Distinctive Ring
The modem is able to discriminate between three different types of rings. This is useful if you
purchase the Telstra Duet service. With Telstra Duet, two phone numbers are shared for one
telephone line. One is for voice and the second is for your modem. To enable the modem to
answer only when your modem number is dialed, issue the command:
AT-SDR=4 S0=2 (This can be saved with AT&W). For most users, AT-SDR=4 will be suitable.
Do not set Auto Answer for less than two rings when Distinctive Ring is enabled.
Distinctive Ring Commands
AT-SDR=n,x where n=0 to 7, default=0,
x=0 Disable Distinctive Ring response suffix;
x=1 Enable Distinctive Ring response suffix (default)
AT-SDR=0 Any ring detected and reported as “RING”
AT-SDR=1,1 Single ring detected and reported as “RING1”
AT-SDR=1,0 Single ring detected and reported as “RING”
AT-SDR=2,1 Double ring detected and reported as “RING2”
AT-SDR=2,0 Double ring detected and reported as “RING”
AT-SDR=3,1 Single and double ring detected and reported as “RING1” or “RING2”
AT-SDR=3,0 Single and double ring detected and reported as “RING”
AT-SDR=4,1 Triple ring detected and reported as “RING3”
AT-SDR=4,0 Triple ring detected and reported as “RING”
AT-SDR=5,1 Single and triple ring detected and reported as “RING1” or “RING3”
AT-SDR=5,0 Single and triple ring detected and reported as “RING”
AT-SDR=6,1 Double and triple ring detected and reported as “RING2” or “RING3”
AT-SDR=6,0 Double and triple ring detected and reported as “RING”
AT-SDR=7 Any ring detected and reported as “RING1” or “RING2” or “RING3”
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Use AT-SDR=4 for Telstra’s Duet service.