AT&T Synapse Installation Manual page 98

 To set the Dial Plan: (Continued)
Figure 107. Dial Plan Settings
System Configuration
Synapse Installation Guide
3. Select the Default Phone Extension Prefix to be the
initial digit used for automatically assigned extension
numbers. For example, if set to 3, and you have existing
extensions 2000 and 2001, the next automatically
assigned extension numbers will increment beginning
with 3000. The Default Phone Extension Prefix
should not match the PSTN Trunk Prefix.
You can still manually assign an extension with a
different prefix number using the Extension Settings
menu. For more information, see the Synapse
Administrator's Guide.
4. Call Appearance mode only—Select the Park
Extension Prefix to be the initial digit used for parked
calls, as shown in Figure 107. For example, if set to 8,
the park extension range would be from 800 to 899.
The Park Extension Prefix should not match the
PSTN Trunk Prefix.
97
If you assign an extension number whose first
digit is the same as an Auto Attendant menu dial
key, callers will be unable to dial that extension.
Instead, they will be connected to that Auto
Attendant menu action. For more information, see
the Synapse Administrator's Guide.