Nortel DMS-100 Series Maintenance Manual page 124

3-8 SMS signaling
With a UTR, the CC conveys the need for a receiver to the SMS. The SMS
goes through the following steps:
1 Request a UTR channel.
2 Instruct the UTR to start monitoring tones.
3 When monitoring starts, the system informs the SMS of digits and
4 When the the receiver is no longer required, the SMS makes the
From this point on the call proceeds normally.
The system requires a receiver request to start the sequence. When the
request arrives from a SMS with no UTR, processing continues.
Call processing features Coin call and Automatic Number
Identification (ANI) processing are grouped as one feature. The software
and hardware used to implement both features are similar.
Coin features apply to coin dial-tone first (CDF) and coin first (CCF) lines
and consist of the following capabilities:
The ANI feature provides a way to determine when a two-party line is active
from the tip or the ring side of the line. This request obtains the correct
billing responsibility for a call.
Both ANI and coin features are implemented through A- and B-bit signaling
patterns transmitted between the SMS and the RCS. These signaling
patterns consist of A- and B-bits and can contain up to nine signaling states.
297-8231-550 Standard 09.01 August 1998
normally performs some translations functions on the digits.
allocated UTR channel available.
ability to scan for off-hook
ability to check for coin presence
ability to check for coin presence during local call overtime
ability to return coins
ability to collect coins