Call control procedures 5-23
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Figure 5-13
Call setup and release using a reseller switch
Reseller
Interexchange
carrier/reseller
IAM
COT
ACM
Inband prompt tone
DTMF SUPPCODE
ANM
REL
RLC
Conversation
<Assume collection condition hold>
(Locally formed)
<Ready to collect SUPPCODE>
REL
RLC
IAM
COT
ACM
ANM
Or terminate here
Conversation
carrier
Interexchange
Note: Dashed lines indicate optional messages.
The DMS-250 switch indicates that it is ready to accept SUPPCODE digits
from the reseller by sending a 400-Hz prompt tone. Any digits dialed before
this prompt tone are ignored.
The collection period can timeout and cause an in-band treatment due to
permanent signaling or partial dial. The periods before permanent signaling
and partial dial timeouts are set in table TRKGRP in the fields PSPDSEIZ
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