It happens on different extensions and different times of the day. I checked a few phones and the RCO was set to 0.
Below is the PARM, ADAN, and VAS.
PARM
LPIB 1800
HPIB 1800
500B 800
SL1B 255
NCR 5000
MGCR 25
CSQI 250
CSQO 250
TUBO NO
NCPU 2
CFWS YES
PCML MU
ALRM NO
ERRM ERR BUG AUD
DTRB 100
TMRK 128
FCDR OLD
PCDR NO
TPO YES
TSO NO
CLID NO
DUR5 NO
MLDN YES
MARP YES
IPIE NO
FRPT NEFR
DCUS NULL
MSCL 200
PMSI
MANU PMS1
PMCR 0
PORT NONE
NDIS 20
OCAC YES
MTRO MR
SBA_ADM_INS 000
SBA_USER 000
BCAP SPEECH
IDLE_SET_DISPLAY
ICON YES
MSEC ON
MSSD MSNV
NKEY 31
TKEY 24
REQ prt
TYPE adan
ADAN HIST
SIZE 65400
USER MTC SCH BUG OSN
ADAN TTY 0
CTYP QSDI
DNUM 0
DES xsm
FLOW NO
USER MTC
XSM YES
TTYLOG 0
BANR YES
ADAN TTY 1
CTYP QSDI
DNUM 1
DES seb
FLOW NO
USER MTC SCH BUG
XSM NO
TTYLOG 0
BANR YES
ADAN TTY 2
CTYP CPSI
DNUM 2
PORT 0
DES CORE
BPS 9600
BITL 8
STOP 1
PARY NONE
FLOW NO
USER MTC TRF SCH BUG OSN
XSM NO
TTYLOG 0
BANR NO
ADAN TTY 3
CTYP CPSI
DNUM 3
PORT 1
DES CORE
BPS 9600
BITL 8
STOP 1
PARY NONE
FLOW NO
USER MTC TRF SCH BUG OSN
XSM NO
TTYLOG 0
BANR YES
ADAN TTY 4
CTYP QSDI
DNUM 4
DES cdr
FLOW NO
USER SCH CTY
XSM NO
TTYLOG 0
BANR YES
ADAN TTY 5
CTYP QSDI
PAGE 001
DNUM 5
DES terminal
FLOW NO
USER MTC TRF SCH BUG
XSM NO
TTYLOG 0
BANR YES
ADAN ELAN 16
CTYP ELAN
DES SYMPOSIUM
N1 512
ADAN ELAN 17
CTYP ELAN
DES CALLPILOT
N1 512
REQ prt
TYPE vas
VAS
VSID 016
DLOP
ELAN 016
SECU NO
INTL 0001
MCNT 9999
VSID 017
DLOP
ELAN 017
SECU YES
INTL 0001
MCNT 9999