Canon IMAGECLASS MF4150 - Manual (Page 169)

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* 1 The Public Switched Telephone Network (PSTN) currently supports 28.8 Kbps
modem speed or lower, depending on telephone line conditions.
* 2 Based on ITU-T Standard Chart No. 1, MMR standard mode.
NOTE
Specifications are subject to change without notice.
Telephone
● Connection
– External telephone/answering machine/data modem