Digi TransPort WR31 User Manual page 252

Configure network interfaces
Answering V.120 calls
To enable V.120 answering from the command interface, set register S0 for the appropriate ASY
port to a non-zero value. For example:
ats0=1
To ensure that you have set S0 for the correct ASY port, either enter it directly on that port or use the
AT\PORT command to select the correct port first.
The actual value for the parameter sets the number of rings the router will wait before answering.
Finally, you must ensure that there are no conflicts with other protocols configured to answer on
other ASY ports. To do this, disable answering for the other ports/protocols or by using the MSN
and/or Sub-address parameters to selectively answer calls to different telephone numbers using
different protocols.
For example, if you have subscribed to the ISDN MSN facility, you may have been allocated say four
telephone numbers ending in 4, 5, 6, and 7. You could then set the MSN parameter for the
appropriate V.120 instance to 4 to configure V.120 to answer only incoming calls to the MSN number
ending in 4.
If PPP answering is enabled, verify that you have not selected the same MSN and Sub-address
values for PPP. If they are the same, V.120 will answer the call only if S0 is set to 1. Otherwise, PPP
will take priority and answer the call.
Digi TransPort WR Routers User Guide
Configure ISDN interfaces
252