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Chapter 3 — DPNSS1/DASS2 features description and implementation Page 837 of 1536
DASS2 feature descriptions
Feature operation
Call Charge Information
Call cost information is sent to the originating PBX at the end of a call.
Calling/Called Line Identity
Identity of the calling and called parties being sent over DASS2 trunks within
limitations of any connected or interconnecting circuits.
Category 1 Call
A voice or data call that must be on a 64 Kbit digital channel. This call may
use the swap feature and may not be intruded upon.
Category 2 and Telephony Calls
With a category 2 call it is desirable to use a digital channel but not essential
and swap may be used if digital. A digital channel is not essential for a
telephony call, swap may not be used and some supplementary features may
be barred.
Closed User Group
A group that are only allowed to communicate with each other but allowing
for some members to make or receive calls from outside the group.
Maintenance Procedure
This provides just a status information interchange.
Network Address Extension
DASS2 allows additional routing information of up to 6 digits to pass through
transparently when required by connected PBX systems.
User to User Signalling and Tie Line Signalling
Customers can send signals over the link during a call to provide services.
One or more channels of a DASS2 link may be allocated as a permanent
circuit to another PBX to provide a tie line.
The use of NT hardware does not change the operation of the existing
DPNSS1/DASS2 feature.
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