Installation guide
Synapse Installation Guide Back to Contents
System Configuration 81      
Direct Inward Dial
When the system is set to Call Appearance mode and a T1 Gateway or SIP Gateway is 
installed, use the Direct Inward Dial page to assign unique telephone numbers to 
specific Desksets. Callers can bypass the Call Queue, Auto Attendant, or Operator by 
using those telephone numbers. The T1 Gateway and SIP Gateway use the Direct Inward 
Dial (DID) data from your Telephone Service Provider to automatically route incoming 
calls. See “Direct Inward Dial” in the Synapse Administrator’s Guide.
Trunk Naming
Name the system trunks for easier identification. For PSTN Gateways, you can assign 
names to all lines—up to 16, depending how many PSTN Gateways are installed. For the 
T1 Gateway, there is only one physical trunk, so only that one trunk can be named. You 
can name SIP accounts on the SIP Account Settings page. Renaming PSTN Gateway 
trunks is highly recommended in Line Appearance mode and when reserving trunks. See 
“Trunk Naming” in the Synapse Administrator’s Guide.
Trunk Reservation
Reserve a PSTN telephone line, T1 channel, or SIP account for an extension, so that only 
that extension can use that line, channel or account for outgoing calls. Trunk reservations 
apply only to outgoing calls. A user with a reserved trunk will not be able to make 
outgoing calls if all lines and channels are busy with incoming calls. If necessary, 911 calls 
use trunks that are reserved for other extensions. See “Trunk Reservation (Outgoing 
Calls)” in the Synapse Administrator’s Guide.
Trunk Routing
Route incoming calls on a PSTN Gateway line, T1 Gateway, or SIP Account to a specific 
destination. See “Trunk Routing (Incoming Calls)” and “DID Assignments” in the 
Synapse Administrator’s Guide.
ATA Settings
Configure the two FXS ports on an ATA. See “Configuring ATA FXS Ports” in the 
Synapse Administrator’s Guide.
SIP Gateway Settings
Enter SIP account details to register the SIP Gateway with your Service Provider. See “SIP 
Gateway Settings” in the Synapse Administrator’s Guide.
T1 Gateway Settings
Modify the settings of your T1 connection. Most installations will use the default settings. 
See “T1 Gateway Settings” in the Synapse Administrator’s Guide.
Fax Configuration
Select a PSTN Gateway line as your fax line and assign an ATA FXS port as your fax line 
destination. You can select a DID number for incoming faxes on the Direct Inward Dial 
Assignments WebUI page. See “Fax Configuration (Requires ATA)” and “DID 
Assignments” in the Synapse Administrator’s Guide.










