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8.3 Answering V.120 Calls
V.120 answering can be enabled from the command interface by setting register S0 for the
appropriate ASY port to a non-zero value. For example:
ats0=1
You should ensure that you have set S0 for the correct ASY port by either entering it directly on that
port or by using the AT\PORT command to select the correct port
fi
rst.
The actual value used for the parameter sets the number of rings the unit will wait before answering.
Finally, you must ensure that there are no con
fl
icts with other protocols con
fi
gured to answer on other
ASY ports. This can be done by disabling 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 con
fi
gure V.120 to answer only incoming calls to the MSN number ending in 4.
You should check that if PPP answering is enabled 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.
