User Guide ISDN Terminal Adapter MTA128ST-USB

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Chapter 4 - AT Commands, S-Registers, and Result Codes
S-register: S45
Function: Use Dial Tone from Central Office
Unit: Decimal ASCII code
Range: n=0 No dial tone
n=1 Use Central Office dial tone
n=2 TA generates dial tone
Default: 1 (Use Central Office dial tone)
Description: S45 allows the TA either to generate a dial tone on the POTS port, block any dial tone on
the POTS port, or allow the dial tone from the central office to pass through to the POTS
port (default). Some countries have central offices that send a loud dial tone through to
the POTS port. This makes DTMF- dialing difficult since DTMF digits have to overcome
the loudness of the dial tone (see S49 and S51 for more information).
S-Register: S46
Function: Pulse-Dial Recognition
Unit: Decimal ASCII code
Range: 0–3
Default: 0
Description: Controls pulse-dial recognition for New Zealand, Sweden, and the de facto standard for
the rest of the world (England, France, India, and USA). S46 selects country where the
TA is being used to recognize pulse-dialing. S46=n
where:
n=0 Disable pulse-dialing (default)
n=1 England, France, India, USA, etc. (# pulses = digit dialed except 0 is 10 pulses)
n=2 New Zealand (# pulses = 10 digits dialed)
n=3 Sweden (# pulses = digit dialed + 1)
S-register: S49
Function: POTS Port Dial Tone Gain
Unit: Decimal ASCII code
Range: n=0 (Low gain—quiet) thru 10 (high gain—loud)
Default: 0 (Low gain—quiet)
Description: Allows POTS port dial tone gain to be adjusted to an appropriate volume. Must be used in
conjunction with S51=1 in order for there to be a noticed change in the dial tone volume.
See S51.
S-Register: S50
Function: Caller Line ID (CLI)
Unit: Decimal ASCII code
Range: 0 or 1
Default: 1 (enabled)
Description: Sets whether the mechanism for identifying two endpoints of a connection is enabled or
disabled. Since RING messages only appear for ISDN data calls, the CLI feature does
not define a means of conveying Calling Party information to the terminal for ISDN voice
calls. CLI information is included only with the first RING message for a given incoming
call and appears as:
RING
FM: 5552000 TO: 5551000
If the Calling Party Number information is not included in the incoming SETUP message,
the RING message appears as follows:
RING
TO: 5551000