
DMA OperationsGuide  Prefix Service
258 Polycom, Inc.
The following table describes the fields in the dialog box. 
See also: 
“Call Server Configuration” on page219 
Edit Vertical Service Code Dialog Box The Edit Vertical Service Code dialog box lets you edit a call forwarding or 
hunt group service invoked when callers dial the vertical service code (VSC) 
for that service followed by the alias. These services are included on the Prefix 
Service page and can’t be deleted. But you can disable them or change their 
names, descriptions, or VSCs (shown in the Prefix Range column of the Prefix 
Service page). If you change the VSCs, be sure to inform all users of the 
change.
Note 
This feature is not related to the Polycom DMA system’s built-in H.323<->SIP 
gateway. Simplified ISDN gateway dialing is for routing calls to H.320 or PSTN 
protocol gateways. 
Table10-21 Fields in the Edit Simplified ISDN Gateway Dialing Prefix dialog box 
Column  Description
Name  A display name for this service. 
Description  Brief description of the service. 
Enabled  Clearing this check box lets you turn off the service 
without deleting it. 
Simplified ISDN dialing 
prefix
The dial string prefix(es) assigned to this service. 
Enter a single prefix (44), a range of prefixes (44-47), 
multiple prefixes separated by commas (44,46), or a 
combination (41, 44-47, 49). 
If your dial plan uses the Dial services by prefix dial rule 
(in the default dial plan) to route calls to services, all dial 
strings beginning with an assigned prefix are forwarded 
to this service for resolution. 
Use all ISDN gateways  Indicates whether this service applies to all available 
gateways or only those selected below. 
Available ISDN 
gateways 
Lists the gateways that have at least one session profile 
specifying an H.320 or PSTN protocol. See “Edit MCU 
Dialog Box” on page128. 
Selected ISDN 
gateways 
Lists the selected gateways. The arrow buttons move 
gateways from one list to the other.