LTE910PS v1.00 User Manual JA16-UM
Page 6 Rev: 00 Date: 07/24/19
© Copyright 2019 Janus Remote Communications
Specifications subject to change without notice
All Rights Reserved See website for latest revision. Not intended for life support applications.
3 Operation continued
3.2 Voice Operation
Voice operation requires a standard voice telephone device to be connected to the POTSwap.
3.2.1 Placing calls:
When the connected telephone device is taken off hook, the POTSwap will present an audio dial tone signal.
Dialing can proceed with up to 30 digits being accepted. If the Dialing Tone Timeout (30 second default) elapses
before the first digit is dialed, the dialing session is ended by an Open Switching Interval (900 millisecond default).
If the Dialing Digit Timeout (4 second default) elapses after a dialed digit, dialing is concluded and a call to
the dialed number is placed. At any time the number sign (‘#’) can be dialed and the call is placed immediatly,
avoiding the Dialing Digit Timeout. Note that if Fixed Format Dialing is enabled, the dialed number
must consist of a ten digit phone number that includes the area code, or an eleven number when
the first digit is a ‘1’.
Telephone devices that automatically take the phone off-hook and place a call to a fixed telephone
number are compatible with the POTSwap. Dialing digits should not be sent faster than 100 ms per
digit, with a minimum DTMF tone duration of 45 ms.
The POTSwap is compatible with DTMF dialing only. Pulse dialing (rotary phones) is not supported.
3.2.2 Receiving calls:
Incoming calls will cause the POTSwap to generate a ringing signal on the phone line. Taking the connected
telephone line off-hook will answer the incoming call. Note that cellular carriers typically impose a 30 second limit
on unanswered ringing before a call is transferred to a voice mail system.
3.2.3 Call Disconnect:
A call can always be terminated by placing the connected telephone equipment on-hook. If a cellular call
is terminated on the carrier side (the result of a connected party ending the call or due to loss of signal) the
POTSwap will use an Open Switching Interval to aid in disconnecting automated type telephone equipment. It
removes the voltage from the phone line connection for a short time to signal that the call has been terminated.
The OSI interval can be adjusted using the user configuration menu.
3.2.4 Unconnected Busy:
In some instances when dialing a number that is busy, the cellular carriers will not make an audio connection
to a busy tone. If this occurs, the POTSwap will generate the busy tone locally for a period defined by the user
configurable Busy Dwell Timeout parameter. Following the busy tone, the POTSwap will terminate the call by
generating an Open Switching Interval (see section 4 - Configuration).
Figure 2 Voice Operation
Mobile
Network
PSTN
