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

67