Dealing with an incoming call

The port monitor deals with an incoming call request as follows:

1. If possible, the caller ID (the telephone number of the calling system) is determined.

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   NOTE: Not all modems implement caller ID. In this release of UnixWare the caller ID is set to NULL.

   For ISDN adapters, the caller ID may or may not be set depending on the operating policy of your telephone company.

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2. The call type is determined. If a match was found in /etc/ics/Autoacts, then the service to invoke has also been determined.

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   NOTE: Modems do not have a consistent way of obtaining the call type. In this release of UnixWare the call type is always set to acu.

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3. If a service has not yet been determined, then the port monitor checks its administrative file (/etc/saf/pmtag/_pmtab in the case of ttymon(1M)) for any services specified for the port, where pmtag is the name of that instance of the port monitor, for example, ``ttymon1''. (See ``Adding a service'' for more details.)

4. If a service has been determined, then call filtering is performed (if enabled).

5. If the service is auto, then call service lookup is performed to determine which service to invoke.

6. The appropriate service is invoked.