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AN93
Rev. 1.3 175
+VLS = <label>
Analog Source / Destination Selection
<label>
Description
0 DCE is on-hook. AOUT disabled. Tone detectors disabled.
Si3000 sample pass-through to DAA is inactive.
1 DCE is off-hook. AOUT disabled. Tone detectors disabled.
4 DCE is on-hook. AOUT connected to tone generators.
Tone detectors disabled.
5 DCE is off-hook. AOUT connected to PSTN.
Tone detectors enabled.
13 DCE is off-hook. V.253 tone event reporting enabled. Si3000 sample
pass-through to DAA is active with options for speakerphone operation.
14 DCE is on-hook. V.253 tone event reporting enabled. Si3000 interface
is active for DTE voice stream pass-through.
15 DCE is off-hook. V.253 tone event reporting enabled. Si3000 sample
pass-through to DAA is active with options for handset operation.
20 DCE is on-hook. AOUT disabled. Tone detectors enabled.
21 DCE is on-hook. AOUT connected to tone generators. Tone detectors
enabled.
Table 117 on page 190 shows the voice-mode operation and the signal paths. See
10.2.4.2 of V.253 for an explanation of the AT +VLS=? command results. If an ATD
command is sent while the DCE is in VLS=0 and +FCLASS=8, the DCE will automati-
cally transition to VLS=1. The ATH command will automatically force the DCE to
VLS=0. The main options of interest are the 0, 13, 14, and 5. The +VLS=0 setting
must be applied first before applying a new +VLS value to ensure the mode is exited
properly.
+VNH = <hook>
Automatic Hangup Control
<hook>
Description
0 The DCE retains automatic hangups as is normal in the other modes
(such as hanging up the phone when the ISOmodem does not detect a data carrier
with a given time interval).
1 The DCE shall disable automatic hangups in the other non-voice
modes.
2 The DCE shall disable all hang-ups in other non-voice modes. The
DCE shall only perform a “logical” hangup (return the OK result code).
+VRA = <interval>
Ringing Tone Goes Away Timer
The DCE only uses this command in call origination transactions. This command sets
the amount of time in 0.1 second units the DCE shall wait between Ringing Tone
before it can assume that the remote modem has gone off-hook. Default time is five
seconds.
+VRID = <rmode>
Repeat Caller ID
<rmode>
Description
0 Display Caller ID information of the last incoming call in formatted
form.
1 Display Caller ID information of the last incoming call in unformatted
form.
Table 110. Extended AT+ Command Set (Continued)
Command Action