Telephone Systems General Description

Features
Destination (Toll) Restriction
Strata CTX General Description 11/02 49
Destination (Toll) Restriction
Strata CTX offers Destination Restriction as a major expansion of traditional Toll Restriction.
Historically, Toll Restriction was used to prevent the unauthorized use of toll prefixes to the PSTN:
long distance (1), operator assistance (0) or international (011).
Strata CTX has expanded this to include restriction based on any string of dialed digits. A true,
international business telephone system, Strata CTX can restrict any string of up to 11 dialed
digits, including

and . Eleven-digit screening allows control of access to individual telephone
numbers in remote Area Codes. Restriction of

and  controls users’ access to vertical service
codes from the CO, such as Camp On and Call Forwarding.
A stations’s Destination Restriction level can be changed automatically with Day/Night mode
Auto Scheduling. One use of this feature is to allow a telephone to make outside calls during the
day, but to restrict them at night.
Through Dialing
A telephone user or an attendant can connect a destination-restricted station to a trunk enabling
temporary access to an outside line. The connected station can then use external dial tone to
complete the call, and revert back to destination-restricted status after the call is completed. This
maintains the integrity of toll restriction, while still extending outgoing calling privileges when
necessary.
Direct Inward Dialing (DID)
This feature allows external callers to dial directly to individual extensions or groups of telephones
without intervention by an operator, IVR or auto attendant. Each incoming DID number, which is
sent to the CTX on a DID line from the CO, can be routed individually to an extension, pooled or
group line button, ACD group, maintenance modem, external page, night bell, voice mail box, or
back out over the public or private telephone network. DID routing assignments can change
automatically when the system switches between the Day and Night Modes.
DID numbers can vary between 1~7 digits in length for each DID line group. Each DID number
can be assigned to 1 of 15 possible music-on-hold sources.
DID service is provided by DID analog, T1, or ISDN line interfaces.
Dialed Number Identification Service (DNIS)
DNIS lines receive 800- and 900-type telephone calls that provide the number the caller dialed to
reach the Strata CTX. The Strata CTX translates the DNIS number into a name that displays on the
telephone’s LCD. This allows the user to identify where the call is coming from and the purpose of
the call before the call is answered.
The DNIS Name/Number routes calls to specific telephones, departments or ACD groups. When
the call is ringing and after it is answered, the DNIS Name/Number displays on the telephone’s
LCD. The name and number display can also be sent to an agent computer to be used by a CTI
application.
Applications include sending DNIS calls to a group of agents that take orders for a number of
different companies and products. The agents know how to answer the calls from the DNIS
display. Using DNIS capabilities allows one group of lines to be used to serve multiple
applications. DNIS service is provided by DID analog, T1 or ISDN line interfaces and provides the
same call routing options and destinations as DID calls.