User`s manual

U.S. Robotics I-modem Command Reference
Displaying Help Screens • Page 13-12
at*$
HELP, Asterisk Commands (CTRL-S to Stop, CTRL-C to Cancel)
*S1=n..n Voice Service Profile Identifier (SPID0)
*S2=n..n Data Service Profile Identifier (SPID1)
*P1=n..n Voice Directory Number (DN0)
*P2=n..n Data Directory Number (DN1)
*V1=n Voice Bearer Capability (DN0)
n=0 3.1 Khz Audio
n=1 Speech
*V2=n Data Bearer Capability (DN1)
n=0 Auto Detect
n=1 V.120 Rate Adaption (Fixed)
n=2 V.110 Rate Adaption (Fixed)
n=3 Modem/Fax Emulation (Fixed)
n=4 Clear Channel (external only)
n=5 Auto Mode for Async-to-sync PPP
*W=n ISDN Switch Protocol Type
n=0 AT&T 5ESS Custom
n=1 Northern Telecom DMS-100
n=2 US National ISDN-1
n=3 US National ISDN-2
*M=n Bus Configuration .
n=0 Point to Point
n=1 Multipoint
*O=n Dialing Mode
n=0 En-Bloc mode
n=1 Overlap Sending mode