Specifications

Session Initiated Protocol
Planning and Installation Guide F – 11
Step 24
Select the n11 check box to enable telephone service calls, such as
directory assistance (e.g., 411 or 611, but not 911, which is specified
below.)
Step 25 Select the 911 check box to enable emergency 911 calls.
NOTE You must have at least one trunk group per site that allows 911 calls.
Step 26 Select the Easy Recognizable Codes (ERC) check box to enable
services such as toll-free dialing calls (e.g., 800, 888, 900).
Step 27 Select the Explicit Carrier Selection check box to enable dialing
special numbers that let the caller select a long-distance carrier (e.g.,
1010xxx).
Step 28 Select the Operator Assisted check box to enable the trunk group to
dial the operator (e.g., 0+).
Step 29 Select the Called ID not blocked by default check box to pass Caller
ID information by default on outbound calls. Note that in the United
States, the user can override this option with Vertical Service Codes.
Step 30 Click the Remove leading 1 from 1+10D check box to drop the leading
"1" if your long-distance service provider requires dialing only ten
digits.
Step 31 Click the Remove leading 1 for Local Area Codes check box to drop
the leading "1" for the local area codes (Local and Additional Local) if
your local service provider requires dialing only ten digits for local area
codes (particularly with overlay area codes).
Step 32 (For all prefixes unless a specific local prefix list is provided below)-
Click the Dial 7 digits for Local Area Code check box to enable the
trunk to dial local numbers in the local area code with seven digits, if
required by your local service providers.
Step 33 Click on the Local Prefixes drop-down menu and select the local prefix
for your site, or click the Go to Local Prefixes List link to view, add,
and edit the local prefixes for your sites. When you are using a local
prefix list, all prefixes not listed are considered "long distance" and
calls to these numbers require a long distance trunk service.
Step 34 Enter a prefix in the Prepend Dial Out Prefix field to have this prefix
prepended to the dial-out string resulting from the other rules. A dial-
out prefix is typically required when connecting to, and leveraging the
trunks on, a legacy PBX. Note that the Dial Out Prefix is not applied to
Off-System Extension calls.
Step 35 For Off System Extensions, click Edit to add or edit any ranges of
extensions that can be accessed through this trunk group. This is
typically used when setting up a tie trunk to a legacy PBX and config-
uring coordinated extension dialing. The Dial Out Prefix rules are not
applied to Off-System Extensions.