Installation guide

96 Planning and Installation Guide ShoreTel 14.2
Trunk Planning and Ordering Dialed Number Identification Service (DNIS)
5
DID numbers are ordered in blocks of 20 or more 10-digit telephone numbers. These numbers are
assigned to a customer and are routed to a wink-start, PRI or SIP trunk connected to a voice switch.
When a call is made, the service provider sends a predefined set of digits, from 3 to 10 digits, via the
wink-start, PRI, or SIP trunk. The voice switches capture the digits and route the calling party to the
called party.
If ANI is not being used on wink-start trunks, only the DNIS digits need to be delivered. If ANI is being
used, the star (*) key must be used to delimit the ANI digits from the DID/DNIS digits as follows:
 <DID>
 <DNIS>
 *<ANI>*<DID/DNIS>*
Dialed Number Identification Service (DNIS)
Dialed Number Identification Service (DNIS) allows extensions on the system, such as users, menus,
workgroups, route points, and so on, to be accessed directly without the need for an auto attendant or
operator. This is particularly useful for workgroup and other call center applications. The DNIS
information is delivered to the ShoreTel Communicator - Personal Access and stored in the call detail
record.
DNIS is available on analog wink-start, digital wink-start, PRI, and SIP trunks.
DNIS numbers are ordered individually and map to a dialed number. When a calling party dials a
specific telephone number, the service provider routes the call to a wink-start or PRI trunk connected
to a voice switch. The service provider sends a predefined set of digits, from 3 to 10 digits — the DNIS
digits — using DTMF signaling or a D-Channel message or SIP message. The voice switches capture
the digits and route the calling party to the called party.
If ANI is not being used on wink-start trunks, only the DNIS digits need to be delivered. If ANI is being
used, the star (*) key must be used to delimit the ANI digits from the DID/DNIS digits as follows:
 <DID>
 <DNIS>
 *<ANI>*<DID/DNIS>*
Outbound Caller ID
ShoreTel sends the user’s DID number as the caller ID number for outbound calls over PRI or SIP
trunks. If the DID number is unavailable, the site Caller Emergency Service ID (CESID) is used. If that
number is unavailable, no caller ID is sent.
Additionally, the outbound caller ID can be configured on a per-user basis such that the configured
value can take precedence over the user's DID number or the site CESID. Note that this feature is only
available on outbound calls using a T1 PRI trunk.
 To send a single main number rather than individual user DID numbers, assign DNIS entries
instead of DID numbers to each user. The Site Contact Number will be sent on outbound calls.