Indication -officers to know when the prisoner is no longer talking even though handset is off hook

[SherWat]

CS1000E at 7.6
I have an analog phone that a prisoner uses to call their lawyer. It is an extension on the PBX. The phone is in an enclosed private room to allow them privacy. However, sometimes they keep the phone up to their ear after the conversation has finished so the officers think they are still talking with their lawyer even though the call has been disconnected so they can't go into the room.

The officers want to be able to know when the call has disconnected, even though the phone is still off hook.

I have tried:
1. program an SCN key with the same DN on the officer phone - still stays lit even after call is disconnected and is off hook
2. program a BFS key with the analog TN - still stays lit even after call is disconnected and is off hook
3. using a POTS line, connected it to a trunk route on the PBX and used it as a PRDN and programmed the analog phone with the PRDN number. The BFS and SCN key on the officer phone still stays lit after disconnect

So the goal here is to have some sort of indication for the officers to know when the prisoner is no longer talking even though they keep the handset off hook.

Maybe what I want to do isn't even possible?

Below are the print outs of the analog TN, the route, the trunk. For most parameters I took the defaults.

DES BOOKNG
TN 000 1 07 05 VIRTUAL
TYPE 500
CDEN 4D
CUST 0
MRT
ERL 00000
WRLS NO
DN 2155 0
AST NO
IAPG 0
HUNT
TGAR 1
LDN NO
NCOS 4
SGRP 0
RNPG 0
XLST
SCI 0
SCPW
CLS CTD DTN FBD XFD WTA THFD FND HTD ONS
LPR XRD AGRD CWD SWD MWD RMMD LPD XHD SLKD CCSD LND TVD
CFTD SFD MRD C6D CNID CLBD AUTU
ICDA CDMD LLCN EHTD MCTD
GPUD DPUD CFXD ARHD OVDD AGTD CLTD LDTD ASCD SDND
MBXD CPFA CPTA DDGA NAMA MIND
MCRD
EXR0 SHL ABDD CFHD DNDY DNO3
CWND USMD USRD BNRD OCBD RTDD RBDD RBHD FAXA CNUD CNAD PGND FTTC
CDMR PRED MCDD T87D SBMD PKCH MPTA ELCD
BFTN 000 1 03 14
PLEV 02
PUID
UPWD
FCAR NO
AACS NO
MLWU_LANG 0
DATE 16 MAR 2017

*************************

TYPE RDB
CUST 00
ROUT 75
DES PRISONER
TKTP COT
NPID_TBL_NUM 0
PRIV YES
SAT NO
RCLS EXT
VTRK NO
NODE
DTRK NO
ISDN NO
PTYP ACO
CNDP UKWN
AUTO NO
ICOG IAO
RANX NO
TRMB YES
STEP
CPP NO
TARG 01
CLEN 1
BILN NO
OABS
TIMR ICF 512
OGF 512
EOD 13952
DSI 34944
NRD 10112
DDL 70
OOD 3
ODT 4096
RGV 640
FLH 510
GRD 896
SFB 3
CRD 512
IENB 5
TFD 0
LEXT 100
VGD 6
SST 3 0
NEDC ETH
FEDC ORG
CPDC NO
SPCT IMM
HOLD 02 02 40
SEIZ 02 02
RGFL 02 02
RVSD 08 31
ILLR 02 02
DRNG NO
CDR NO
MUS NO
MR NO
MANO NO
EQAR NO
OHQ NO
OHQT 00
TTBL 0
ATAN NO
OHTD NO
PLEV 2
MCTS NO
ALRM NO
ART 0
SGRP 0
ARDN NO
CTBL 0
AACR NO
************
DES PRISONER
TN 000 0 04 00 VIRTUAL
TYPE COT
CDEN 8D
CUST 0
XTRK XUT
TIMP 600
BIMP 3COM
TRK ANLG
NCOS 0
RTMB 75 1
PRDN 2155
CMF NO
SIGL LOP
SUPN NO
AST NO
IAPG 0
CLS UNR DIP CND ECD WTA LPR APN THFD SPCD
P10 TRC
TKID
AACR NO
DATE 16 MAR 2017

Thanks everyone!

 

[StanleySteamer]

Check out the feature guide for Off-Hook Alarm Security. It's been a while since I used it but it might be useful for you.

 

[SherWat]

Thanks for the suggestion.
I have done some reading and in my test environment did some of the programming changes and it appears to do the trick for what we want. Just have to do a bit of tweaking for timers and such, but I think this is the solution! Thanks!

 

[phonetech2012]

I'd love to see their face when the door opens up and they try to say they are still on the phone! Great stuff! I guess after you get the alarm you can trace the call and print it out to prove there was no established call.