Multi-Tech Systems MT2834BLR - Manual (Page 73)

If a telephone or other device is connected in parallel with the modem, the
combined REN must not exceed 4. A BT supplied telephone may be
assumed to have REN of 1.0 unless otherwise noted.
The approval of this modem for connection to the British Telecom public
switched telephone network is INVALIDATED if the apparatus is subject to
any modification in any material way not authorized by BABT or if it is used
with or connected to:
i. internal software that has not been formally accepted BABT.
ii. external control software or external control apparatus which cause the
operation of the modem associated call set-up equipment to contravene
the requirements of the standard set out in BABT/SITS/82/005S/D.
All other apparatus connected to this modem and thereby connected
directly or indirectly to the British Telecom public switched telephone
network must be approved apparatus as defined in Section 22 of the
British Telecommunications Act 1984.
The REN number for this apparatus = 1
7.1.3 Compliance with BS6789: Section 3.1 and Part 2
a. The modem is not capable of allowing Auto Call using '999' or other PABX
emergency numbers.
b. Modes other than modes 1, 2, or 3 should not be used on the BT PSTN.
This modem is a mode 1 device.
c. Users are advised to check the numbers entered during the Auto Call set
up phase prior to dialing.
d. The user should not issue any sequence of commands to the modem
which would cause the modem to exceed the maximum allowable pause
of 8 seconds from the time the modem goes off hook until dialing begins.
e. For correct operation of the call progress monitor, the power has to be
properly connected and switched on.