POTSwap User Guide JA16-EVDO-UM
Page 6 Rev: P07 Date: 08/01/16
© Copyright 2016 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 continued
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).
