Installation guide

Installation 36
Synapse Installation Guide
ATA Fax Line Configuration
To support fax on the Synapse system, you should consider where the fax is, and which telephone line will be used for incoming
faxes. Fax line configuration for the Synapse system differs depending on whether you are using a PSTN Gateway or a T1 Gateway.
PSTN Gateway
The PSTN fax line can be connected to any FXO port (LINE 1–4) on the PSTN Gateway. However, trunks for outgoing calls are
seized in ascending order (LINE 1 then LINE 2, and so on). To avoid using the fax line for outgoing voice calls, make the fax line
the highest possible numbered line on the highest numbered Gateway. Use the Fax Configuration page in the WebUI to select
a telephone line on the PSTN Gateway as the fax line. See “Fax Configuration” on page 119.
If your office has heavy fax volume, the fax line should be a separate dedicated line, and not part of a hunt group.
If your office has low fax volume, your telephone service provider may be able to include your fax line in the hunt group. This
way, you can save on the expense of a separate fax line. In this scenario, you can maximize your system for voice usage while
maintaining the capacity to send or receive the occasional fax.
You should consider the following issues when fax and voice calls share a PSTN Gateway line:
 Incoming calls that get routed through the PSTN Gateway fax line are automatically checked by the system for a fax
signal. Voice callers will experience a delay of up to eight seconds before the call is connected to the Auto Attendant or
Operator.
 For outgoing calls, the caller ID of the fax number may be sent instead of the primary business telephone number. If the
recipient returns a missed call via their caller ID log, the caller will then experience the eight-second delay mentioned
above.
T1 Gateway
When a T1 Gateway is installed, you can assign a DID number for the fax machine on the Fax Configuration WebUI page. See
“Fax Configuration” on page 119. Incoming faxes are routed directly to that DID number (with no eight-second delay), and
outgoing faxes are sent with the DID number as their caller ID.