User guide

Chapter 5 - AT Commands

!C0=n Network Switch Type

Values: n = 0, 1, 2, or 5

Default: !C0=2 (International—NET3)

!C0=5 (USA—US N1-1)

Selects one of the network switch types supported by ISIHx cards. International factory

default setting is !C0=1 (Northern Telecom DMS-100). Default for USA is !C0=5 (USA—US

N1-1).

!C0=0 AT&T 5ESS

!C0=1 Northern Telecom DMS-100

!C0=2 NET3 (Euro ISDN)

!C0=5 US NI-1

!C6=n SPID 0

Values: n = 0–20-character string

Default: null string

Specifies the channel 0 service profile identifier (SPID) that the ISDN service provider

assigned at subscription time. The data SPID string can have up to 20 characters.

Note: For DMS-100 switches, any ASCII character except the underline (_) character is valid. For NI-

1 and AT&T switches, only the digits 0–9 are valid. (Not needed for NET3 switch type.)

*!C6=n SPID 1

Values: n = 0- to 20-character string

Default: null string

Specifies the channel 1 service profile identifier (SPID) that the ISDN service provider

assigned at subscription time. The voice SPID string can have up to 20 characters.

Note: For DMS-100 switches, any ASCII character except the underline (_) character is valid. For NI-

1 and AT&T switches, only the digits 0–9 are valid. (Not needed for NET3 switch type.

!D0=n V.120 LLC Information Element

Unit: Decimal ASCII code

Values: n=0 (disable),

n=1 (enable)

Default: !D0=0 (disabled)

Some switches do not support ISDN SETUP messages that contain a LLC (Low Layer

Compatibility) Information Element (IE). When these switches receive a LLC IE in the

SETUP they immediately reject the call and then the TA reports NO CARRIER. The LLC IE

for V.120 may be disabled by using !D0=0 to avoid problems with switches that do not

support a LLC IE. The V.120 LLC IE only helps the answering TA determine the type of

digital call and various options associated with that call and so it is not necessary.