Compaq Armada V300 Series Reference Manual page 186

This device is equipped with pulse dialing, while the Telecom
standard is DTMF tone dialing. There is no guarantee that
Telecom lines will always continue to support pulse dialing.
Use of pulse dialing, when this equipment is connected to the
same line as other equipment, may give rise to bell tinkle or noise
and may also cause a false answer condition. Should such
problems occur, the user should not contact the Telecom Faults
Service.
Some parameters required for compliance with Telecom's
Telepermit requirements are dependent on the equipment (PC)
associated with this device. The associated equipment shall be set
to operate within the following limits for compliance with
Telecom's Specifications:
a) There shall be no more than 10 call attempts to the same
number within any 30-minute period for any single manual
call initiation, and
b) The equipment shall go on-hook for a period of not less than
30 seconds between the end of one attempt and the beginning
of the next attempt.
Where automatic calls are made to different numbers, the
equipment shall go on-hook for a period of not less than 5 seconds
between the end of one attempt and the beginning of the attempt.
The equipment shall be set to ensure that calls are answered
between 3 and 30 seconds of receipt of ringing (S0 set between 2
and 10). This ensures:
a) A person calling your modem will hear a short burst of
ringing before the modem answers. This confirms that the
call has been successfully switched through the network.
b) Caller identification (which occurs between the first and
second ring cadences) is not destroyed.
This equipment does not fully meet Telecom's impedance
requirements. Performance limitations may occur when used in
conjunction with some parts of the network. Telecom will accept
no responsibility should difficulties arise in such circumstances.
This equipment should not be used under any circumstances
which may constitute a nuisance to other Telecom customers.
This equipment shall not be set to make automatic calls to the
Telecom '111' Emergency Service.