Someone (Donna McClure) got the NUMBER BUSY while I was tracing. I tried to stop the string soon after the problem occurred. Here's the string - maybe something within will be helpful.
Internal=1 Time=11523 AState=Idle
2293393mS CMExtnEvt: v=12 State, new=PortRecoverDelay old=Connected,0,0,
2293393mS CMExtnTx: v=120, p1=12
CMReleaseComp
Line: type=DigitalExtn 2 Call: lid=0 id=12 in=0
BChan: slot=16 chan=14
UUI type=Local [....] [0x03 0x00 0x00 0x0e ]
Timed: 28/12/06 11:58
2293393mS CD: CALL: 0.14454.0 Deleted
2293394mS CMExtnTx: v=109, p1=8
CMReleaseComp
Line: type=DigitalExtn 2 Call: lid=0 id=8 in=0
BChan: slot=16 chan=10
UUI type=Local [....] [0x03 0x02 0x00 0x0e ]
Timed: 28/12/06 11:58
2293503mS RES: Thu 28/12/2006 11:58:27 FreeMem=19558752(21) CMMsg=7 (8) Buff=200 997 1000 1697 Links=6855
2293578mS CMExtnTxP: v=999
CMShortCode
Line: type=NoLine 0 Call: lid=0 id=-1 in=0
ShortCode MONChange (59) = [DonnaMcClure] Calling[state] Type=Default (100)
Display [14.-1.0]
2293579mS CMExtnTxP: v=999
CMShortCode
Line: type=NoLine 0 Call: lid=0 id=-1 in=0
ShortCode MONChange (59) = [DonnaMcClure] Calling[SetCurrent] Type=Default (100)
2293680mS CMExtnTxP: v=1002
CMShortCode
Line: type=NoLine 0 Call: lid=0 id=-1 in=0
ShortCode MONChange (59) = [] Calling[moncache] Type=Default (100)
UUI type=Tag [s/DonnaMcClure/14.] [0x73 0x2f 0x44 0x6f 0x6e 0x6e 0x61 0x4d 0x63 0x43 0x6c 0x75 0x72 0x65 0x2f 0x31 0x34 0x00 ]
2295360mS CMExtnRx: v=109, p1=8
CMSetup
Line: type=DigitalExtn 2 Call: lid=0 id=8 in=0
BC: CMTC=Speech CMTM=Circuit CMTR=64 CMST=Default CMU1=ULaw
2295360mS CMExtnEvt: v=8 State, new=DialReq old=PortRecoverDelay,0,0,
2295361mS CMCallPkt: v=14456
CMSetup
Line: type=DigitalExtn 2 Call: lid=0 id=14456 in=0
Calling[109] Type=Internal (101)
BC: CMTC=Speech CMTM=Circuit CMTR=64 CMST=Default CMU1=ULaw
BChan: slot=16 chan=10
2295361mS CMTARGET: LOOKUP CALL ROUTE:7443 type=100 called_party= sub= calling=109 in=0 complete=0
2295361mS CMTARGET: ADD TARGET:7443 number= type=100 depth=1 nobar=1 setorig=1
2295362mS CMTARGET: LOOKUP CALL ROUTE:7443 returned 0
2295362mS CMCallEvt: v=14456 State, new=Dialling old=Idle,0,0,Astate
2295362mS CD: CALL: 0.14456.0 BState=Idle Cut=0 Music=0.0 Aend="DonnaMcClure(109)" (16.10) Bend="" [] (0.0) CalledNum= () CallingNum=109 () Internal=1 Time=1 AState=Dialling
2295363mS CMExtnEvt: v=8 State, new=Dialling old=DialReq,0,0,
2295363mS CMExtnTx: v=109, p1=8
CMInbandTone
Line: type=DigitalExtn 2 Call: lid=0 id=8 in=0
BChan: slot=16 chan=10
UUI type=User2User [TD1\r\n] [0x54 0x44 0x31 0x0d 0x0a ]
Cause=16, Normal call clearing
Timed: 28/12/06 11:58
2295363mS CMExtnTx: v=109, p1=8
CMSetupAck
Line: type=DigitalExtn 2 Call: lid=0 id=8 in=0
BChan: slot=16 chan=10
Timed: 28/12/06 11:58
2295364mS CMCallEvt: v=14456 State, new=LocalDial old=Dialling,0,0,Astate
2295364mS CD: CALL: 0.14456.0 BState=Idle Cut=0 Music=0.0 Aend="DonnaMcClure(109)" (16.10) Bend="" [] (0.0) CalledNum= () CallingNum=109 () Internal=1 Time=3 AState=LocalDial
2295364mS CMMap: a=16.10 b=0.0 D1
2295395mS CMExtnTxP: v=999
CMShortCode
Line: type=NoLine 0 Call: lid=0 id=-1 in=0
ShortCode MONChange (59) = [DonnaMcClure] Calling[state] Type=Default (100)
Display [2.-1.0]
2295396mS CMExtnTxP: v=999
CMShortCode
Line: type=NoLine 0 Call: lid=0 id=-1 in=0
ShortCode MONChange (59) = [DonnaMcClure] Calling[SetCurrent] Type=Default (100)
2295396mS CMExtnEvt: v=12 State, new=Idle old=PortRecoverDelay,0,0,
2295457mS CMExtnRx: v=109, p1=8
CMReleaseComp
Line: type=DigitalExtn 2 Call: lid=0 id=8 in=0
2295457mS CMExtnEvt: v=8 State, new=PortRecoverDelay old=Dialling,0,0,
2295457mS PRN: CALL: 0.14456.0 Deleted leaving 5 CMCall objects
2295457mS CMMap: a=16.10 b=0.0 D0
2295459mS CMCallEvt: v=14456 State, new=Idle old=LocalDial,0,0,Astate
2295459mS CMCallEvt: v=14456 State, new=Idle old=Idle,0,0,BState
2295459mS CALL:2006/12/2811:58,00:00:00,000,109,O,,,DonnaMcClure,,,1,,""
2295460mS CMExtnTx: v=109, p1=8
CMInbandTone
Line: type=DigitalExtn 2 Call: lid=0 id=8 in=0
BChan: slot=16 chan=10
UUI type=User2User [TD0\r\n] [0x54 0x44 0x30 0x0d 0x0a ]
Cause=16, Normal call clearing
Timed: 28/12/06 11:58
2295460mS CD: CALL: 0.14456.0 Deleted
2295460mS CMExtnTx: v=109, p1=8
CMReleaseComp
Line: type=DigitalExtn 2 Call: lid=0 id=8 in=0
BChan: slot=16 chan=10
UUI type=Local [....] [0x03 0x02 0x00 0x0e ]
Timed: 28/12/06 11:58
2295501mS CMExtnTxP: v=1002
CMShortCode
Line: type=NoLine 0 Call: lid=0 id=-1 in=0
ShortCode MONChange (59) = [] Calling[moncache] Type=Default (100)
UUI type=Tag [s/DonnaMcClure/2.] [0x73 0x2f 0x44 0x6f 0x6e 0x6e 0x61 0x4d 0x63 0x43 0x6c 0x75 0x72 0x65 0x2f 0x32 0x00 ]
2295603mS CMExtnTxP: v=999
CMShortCode
Line: type=NoLine 0 Call: lid=0 id=-1 in=0
ShortCode MONChange (59) = [DonnaMcClure] Calling[state] Type=Default (100)
Display [14.-1.0]
2295604mS CMExtnTxP: v=999
CMShortCode
Line: type=NoLine 0 Call: lid=0 id=-1 in=0
ShortCode MONChange (59) = [DonnaMcClure] Calling[SetCurrent] Type=Default (100)
2295705mS CMExtnTxP: v=1002
CMShortCode
Line: type=NoLine 0 Call: lid=0 id=-1 in=0
ShortCode MONChange (59) = [] Calling[moncache] Type=Default (100)
UUI type=Tag [s/DonnaMcClure/14.] [0x73 0x2f 0x44 0x6f 0x6e 0x6e 0x61 0x4d 0x63 0x43 0x6c 0x75 0x72 0x65 0x2f 0x31 0x34 0x00 ]
2295998mS PRN: 1672 bytes @01e37dec were allocated by 00b81220 00000000 at 675778150 mS
2295999mS PRN: 1672 bytes @01e38b2c were allocated by 00950500 00000000 at 675795350 mS
2295999mS PRN: 1672 bytes @01e3a928 were allocated by 00b81220 00000000 at 675787421 mS
2297428mS CMExtnRx: v=140, p1=26
CMReleaseComp
Line: type=DigitalExtn 2 Call: lid=0 id=26 in=0
2297428mS CMExtnEvt: v=26 State, new=PortRecoverDelay old=Connected,0,0,
2297428mS PRN: CALL: 1.17.1 Deleted leaving 4 CMCall objects
2297428mS CMMap: a=33.8 b=16.28 M0
2297431mS CMCallEvt: v=17 State, new=Idle old=Connected,0,0,Astate
2297431mS CMCallEvt: v=17 State, new=Idle old=Connected,0,0,BState
2297432mS CALL:2006/12/2811:57,00:01:09,004,8582779648,I,300,5882,,,,0,,""
2297432mS CMLineTx: v=1
CMReleaseComp
Line: type=Q931Line 1 Call: lid=1 id=17 in=1
Cause=16, Normal call clearing
2297433mS CD: CALL: 1.17.1 BState=Idle Cut=0 Music=0.0 Aend="none" (33.8) Bend="Main(300)" [MailRoom] (16.28) CalledNum=300 () CallingNum=8582779648 () Internal=1 Time=27682 AState=Idle
2297433mS CD: CALL: 1.17.1 Deleted
2297434mS CMExtnTx: v=140, p1=26
CMReleaseComp
Line: type=DigitalExtn 2 Call: lid=0 id=26 in=0
BChan: slot=16 chan=28
UUI type=Local [....] [0x03 0x00 0x00 0x0e ]
Timed: 28/12/06 11:58
2297434mS ISDNL2Tx: v=1 peb=1
0000 00 01 90 40 08 02 82 67 45 08 02 80 90 ...@...gE....
2297435mS ISDNL1Tx: v=1 peb=1
0000 00 01 90 40 08 02 82 67 45 08 02 80 90 ...@...gE....
2297441mS ISDNL1Rx: v=1 peb=1
0000 00 01 01 92 ....
2297441mS ISDNL2Rx: v=1 peb=1
0000 00 01 01 92 ....
2297461mS CMExtnEvt: v=8 State, new=Idle old=PortRecoverDelay,0,0,
2297618mS CMExtnTxP: v=999
CMShortCode
Line: type=NoLine 0 Call: lid=0 id=-1 in=0
ShortCode MONChange (59) = [DonnaMcClure] Calling[state] Type=Default (100)
Display [0.-1.0]
2297618mS CMExtnTxP: v=999
CMShortCode
Line: type=NoLine 0 Call: lid=0 id=-1 in=0
ShortCode MONChange (59) = [DonnaMcClure] Calling[stateidle] Type=Default (100)
2297719mS CMExtnTxP: v=1002
CMShortCode
Line: type=NoLine 0 Call: lid=0 id=-1 in=0
ShortCode MONChange (59) = [] Calling[moncache] Type=Default (100)
UUI type=Tag [s/DonnaMcClure/0.] [0x73 0x2f 0x44 0x6f 0x6e 0x6e 0x61 0x4d 0x63 0x43 0x6c 0x75 0x72 0x65 0x2f 0x30 0x00 ]
2298159mS ISDNL1Rx: v=1 peb=1
0000 02 01 40 92 08 02 02 67 4d ..@....gM
2298160mS ISDNL2Rx: v=1 peb=1
0000 02 01 40 92 08 02 02 67 4d ..@....gM
2298160mS ISDNL2Tx: v=1 peb=1
0000 00 01 92 42 08 02 82 67 5a ...B...gZ
2298161mS ISDNL1Tx: v=1 peb=1
0000 00 01 92 42 08 02 82 67 5a ...B...gZ
2298166mS ISDNL1Rx: v=1 peb=1
0000 00 01 01 94 ....
2298167mS ISDNL2Rx: v=1 peb=1
0000 00 01 01 94 ....
2299441mS CMExtnEvt: v=26 State, new=Idle old=PortRecoverDelay,0,0,
********** Warning: Logging to Screen Stopped **********