Installation guide

Installation 35
Synapse Installation Guide
Assigning Telephone Lines and Extensions
This section discusses various telephone line configuration issues to consider.
Providing Limited Telephone Service During AC Power Outages
PSTN Gateway
The fourth line on each PSTN Gateway is a Bypass port that works during AC power failures. If you have a PSTN line plugged into
LINE 4, connect a line-powered analog telephone to the RJ-11 jack labeled BYPASS for telephone service during power failures.
When power returns, a relay disconnects this emergency bypass line so that the bypass line cannot be used to eavesdrop on
normal calls.
If your telephone lines are part of a hunt group (a telephone company feature that allows calls to a busy phone number to roll
over to the next available telephone line), connect the line with your main (pilot) telephone number to PSTN Gateway LINE 4.
If your system features both PSTN Gateways and a T1 Gateway, outbound calls are placed first through the T1 channels.
T1 Gateway
The T1 Gateway provides no analog bypass port. To provide telephone communication during power outages, either subscribe to
at least one analog phone line and install a PSTN Gateway or use uninterruptible power supplies to provide power to your
computer network, the Synapse T1 Gateway, and one or more system Desksets.
Analog Line Connection Order on PSTN Gateways
For outgoing calls, the system first seizes the lowest idle PSTN port numbers (as labeled on the PSTN Gateway). PSTN phone lines
should be connected to your system with your busiest incoming line placed in the highest port number on the highest numbered
PSTN Gateway, so that incoming calls are less likely to receive busy signals. For instance, if your customer service team receives
many calls, you would want to plug their phone lines into higher-numbered PSTN ports.