Lenovo ThinkPad 770Z TP 770X On-line User's Guide that came preloaded on the s - Page 20

Using the Modem Features, exchange PBX or some other type of digital telephone extension

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Using the Modem Features The ThinkPad modem enables you to send or receive data, faxes, and voice over the telephone line. This modem uses a digital signal processor (DSP) and its software can be upgraded, allowing great flexibility. It enables you to enhance the modem capability to support ITU-T V.90 protocols with data rates of 56 Kbps. You can use the ThinkPad modem only on a public-switched telephone network (PSTN). You cannot use a private branch exchange (PBX) or some other type of digital telephone extension line. If you connect the modem to a line other than PSTN, an error message appears, preventing you from using the line. If you are not sure which kind of phone line you are using, contact your telephone company. 12 IBM ThinkPad 770X Online Book

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Using the Modem Features
The ThinkPad modem enables you to send or receive data, faxes,
and voice over the telephone line.
This modem uses a digital signal
processor (DSP) and its software can be upgraded, allowing great
flexibility.
It enables you to enhance the modem capability to support
ITU-T V.90 protocols with data rates of 56 Kbps.
You can use the ThinkPad modem only on a public-switched
telephone network (PSTN).
You cannot use a private branch
exchange (PBX) or some other type of digital telephone extension
line.
If you connect the modem to a line other than PSTN, an error
message appears, preventing you from using the line.
If you are not
sure which kind of phone line you are using, contact your telephone
company.
12
IBM ThinkPad 770X Online Book