Zeacom uses TAPI to intercept all incoming calls. The application performs call routing, voicemail and reporting. You have to build all hgs and phantom extensions in IPO. Call are distributed from a hg to a phantom user before being distributed to a "real" agent.
What you can do is fire up sysmon and trap one call. Search for "display" to see what is being displayed for the extension.
Below is my analysis of an error - stuck queued call sans the display that you are looking for. I have posted this for your benefit so that you may trace a Zeacom call using sysmon.
Call from 5186973430 arrives and routes to HorizonMainAA
61192093mS ISDNL3Evt: v=2 stacknum=2 State, new=Present, old=NullState id=3
61192095mS CMLineRx: v=2
CMSetup
Line: type=Q931Line 2 Call: lid=2 id=3 in=1
Called[4192] Type=Unknown (0) Reason=CMDRdirect SndComp Calling[5186973430] Type=Unknown Plan=ISDN Pres=Allowed (0)
BC: CMTC=Speech CMTM=Circuit CMTR=64 CMST=Default CMU1=ULaw
BChan: slot=0 chan=5
61192095mS PRN: Q931Trunk: Found QBChannel to match 0.5 --> 35.6
61192096mS CMCallEvt: 0.29706.0 -1 BaseEP: NEW CMEndpoint 135f13c TOTAL NOW=42 CALL_LIST=19
61192096mS CMCallEvt: CREATE CALL:3522 (132348)
61192097mS CMCallEvt: 0.29707.0 -1 BaseEP: NEW CMEndpoint 1356088 TOTAL NOW=43 CALL_LIST=19
61192103mS CD: CALL: 2.3.1 BState=Idle Cut=1 Music=0.0 Aend="Line 2" (35.6) Bend="" [] (0.0) CalledNum=4192 () CallingNum=5186973430 () Internal=0 Time=7 AState=Idle
61192103mS CMCallEvt: 2.3.1 3522 Q931 Trunk:2 CHAN=5: StateChange: END=A CMCSIdle->CMCSDialInitiated
61192104mS CMTARGET: 2.3.1 3522 Q931 Trunk:2 CHAN=5: LOOKUP CALL ROUTE: type=0 called_party=4192 sub= calling=5186973430 dir=in complete=1 ses=0
61192104mS CMTARGET: 2.3.1 3522 Q931 Trunk:2 CHAN=5: SET BESTMATCH: length 4 vs 0 match=8002444192 dest=HorizonAAMain
61192105mS CMCallEvt: Priority hike: call 3522 priority 0->1
61192105mS CMTARGET: 2.3.1 3522 Q931 Trunk:2 CHAN=5: LOOKUP ICR: DDI= CGPN=5186973430 (Destination HorizonAAMain ) => CDPN=HorizonAAMain
61192105mS CMTARGET: 2.3.1 3522 Q931 Trunk:2 CHAN=5: ADD TARGET (N): number=HorizonAAMain type=0 depth=1 nobar=1 setorig=1 ses=0
61192106mS CMTARGET: 2.3.1 3522 Q931 Trunk:2 CHAN=5: HG call targeting occuring here
61192107mS CMTARGET: 2.3.1 3522 Q931 Trunk:2 CHAN=5: PrimeForHGTarget: HorizonAAMain setorig=1 recall=0 resetExtnVars 1
61192107mS CMCallEvt: Priority hike: call 3522 priority 1->5
61192107mS CMTARGET: 2.3.1 3522 Q931 Trunk:2 CHAN=5: AddHGTarget HorizonAAMain (depth=2) allowq=1 type=CMNTypeUnknown
61192107mS CMACD: ACDQ(HorizonAAMain)::CanCallJoinQueue 3522 YES - Calls at priority(2) or above=0 (Qlimit=99)
61192108mS CMCallEvt: 0.29708.0 -1 BaseEP: NEW CMEndpoint 12d8058 TOTAL NOW=44 CALL_LIST=20
61192108mS CMACD: 0.29708.0 3522 ACDTep(HorizonAAMain) Q(1) Ann(0) ForceQ(0) Recall(0) InhibitHOQ(0) Sync1(0) Sync2(0)
61192109mS CMTARGET: 2.3.1 3522 Q931 Trunk:2 CHAN=5: INITIAL TARGETING SUCCEEDED
61192109mS CMTARGET: 2.3.1 3522 Q931 Trunk:2 CHAN=5: GetNoAnswerTimer:30
61192110mS CMCallEvt: 2.3.1 3522 Q931 Trunk:2 CHAN=5: StateChange: END=A CMCSDialInitiated->CMCSDialled
61192110mS CMLineTx: v=2
CMProceeding
Line: type=Q931Line 2 Call: lid=0 id=3 in=1
BChan: slot=0 chan=5
61192111mS CMCallEvt: 0.29707.0 3522 TargetingEP: StateChange: END=B CMCSIdle->CMCSOffering
61192112mS CMCallEvt: 0.29708.0 3522 ACDTep(HorizonAAMain): StateChange: END=T CMCSIdle->CMCSOffering
61192112mS CMACD: 0.29708.0 3522 ACDTep(HorizonAAMain) ProcessOutboundMsg CMSetup
61192113mS CMTARGET: 2.3.1 3522 Q931 Trunk:2 CHAN=5: CancelTimer CMTCNoAnswerTimeout
61192113mS CMCallEvt: 0.29708.0 3522 ACDTep(HorizonAAMain): StateChange: END=T CMCSOffering->CMCSRinging
61192114mS CMCallEvt: 0.29707.0 3522 TargetingEP: StateChange: END=B CMCSOffering->CMCSRinging
61192114mS CMCallEvt: 2.3.1 3522 Q931 Trunk:2 CHAN=5: StateChange: END=A CMCSDialled->CMCSRingBack
Call rings then connects Ann30
61192293mS CD: CALL: 2.3.1 BState=Idle Cut=1 Music=2.0 Aend="Line 2" (35.6) Bend="Ann30(1179)" [Ann30(1179)] (0.0) CalledNum=1179 (Ann30) CallingNum=5186973430 () Internal=0 Time=197 AState=Ringing
61193735mS CD: CALL: 2.3.1 BState=Connected Cut=3 Music=0.0 Aend="Line 2" (35.6) Bend="Ann30(1179)" [Ann30(1179)] (23.32) CalledNum=1179 (Ann30) CallingNum=5186973430 () Internal=0 Time=1639 AState=Connected
Call connects to ConsumerEndUser
61223147mS CD: CALL: 2.3.1 BState=Ringing Cut=1 Music=2.0 Aend="Line 2" (35.6) Bend="ConsumerEndUser(4409)" [] (0.0) CalledNum=4409 (ConsumerEndUser) CallingNum=5186973430 () Internal=0 Time=31051 AState=Connected
Call connects to Ann2
61228302mS CD: CALL: 2.3.1 BState=Idle Cut=1 Music=0.0 Aend="Line 2" (35.6) Bend="Ann2(1151)" [Ann2(1151)] (0.0) CalledNum=1151 (Ann2) CallingNum=5186973430 () Internal=0 Time=36205 AState=Connected
Call connects to ConsumerEndUser
61248092mS CD: CALL: 2.3.1 BState=Ringing Cut=1 Music=2.0 Aend="Line 2" (35.6) Bend="ConsumerEndUser(4409)" [] (0.0) CalledNum=4409 (ConsumerEndUser) CallingNum=5186973430 () Internal=0 Time=55996 AState=Connected
Call connects to Ann28
61308230mS CD: CALL: 2.3.1 BState=Idle Cut=1 Music=0.0 Aend="Line 2" (35.6) Bend="Ann28(1177)" [Ann28(1177)] (0.0) CalledNum=1177 (Ann28) CallingNum=5186973430 () Internal=0 Time=116134 AState=Connected
Call connects to ConsumerEndUser
61344071mS CD: CALL: 2.3.1 BState=Ringing Cut=1 Music=2.0 Aend="Line 2" (35.6) Bend="ConsumerEndUser(4409)" [] (0.0) CalledNum=4409 (ConsumerEndUser) CallingNum=5186973430 () Internal=0 Time=151975 AState=Connected
Call connects to Ann10
61404216mS CD: CALL: 2.3.1 BState=Idle Cut=1 Music=0.0 Aend="Line 2" (35.6) Bend="Ann10(1159)" [Ann10(1159)] (0.0) CalledNum=1159 (Ann10) CallingNum=5186973430 () Internal=0 Time=212120 AState=Connected
Call connects to ConsumerEndUser
61476970mS CD: CALL: 2.3.1 BState=Ringing Cut=1 Music=2.0 Aend="Line 2" (35.6) Bend="ConsumerEndUser(4409)" [] (0.0) CalledNum=4409 (ConsumerEndUser) CallingNum=5186973430 () Internal=0 Time=284873 AState=Connected
Call is picked up by Dave using group monitor button
62851422mS PRN: DaveL: DSS Emulation 46 Key Pressed 14
62851422mS CMExtnEvt: DaveL: Pickup from HG(ConsumerEndUser)
62851422mS CMCallEvt: 0.31320.0 -1 BaseEP: NEW CMEndpoint 13498c0 TOTAL NOW=59 CALL_LIST=27
Dave manually transfers call to ConsumerEndUser
62855747mS CMTARGET: 0.31325.0 3722 DaveL.1: LOOKUP CALL ROUTE: type=100 called_party=4409 sub= calling=5186973430 dir=out complete=0 ses=0
Call connects to ConsumerEndUser
62856147mS CD: CALL: 2.3.1 BState=Ringing Cut=1 Music=2.0 Aend="Line 2" (35.6) Bend="ConsumerEndUser(4409)" [] (0.0) CalledNum= () CallingNum=5186973430 () Internal=0 Time=2534 AState=Connected
Call connects to Ann12
62861266mS CD: CALL: 2.3.1 BState=Idle Cut=1 Music=0.0 Aend="Line 2" (35.6) Bend="Ann12(1161)" [Ann12(1161)] (0.0) CalledNum=1161 (Ann12) CallingNum=5186973430 () Internal=0 Time=7652 AState=Connected
Call connects to ConsumerEndUser
62923099mS CD: CALL: 2.3.1 BState=Ringing Cut=1 Music=2.0 Aend="Line 2" (35.6) Bend="ConsumerEndUser(4409)" [] (0.0) CalledNum=4409 (ConsumerEndUser) CallingNum=5186973430 () Internal=0 Time=69486 AState=Connected
Call connects to Ann8
62923124mS CD: CALL: 2.3.1 BState=Idle Cut=1 Music=0.0 Aend="Line 2" (35.6) Bend="Ann8(1157)" [Ann8(1157)] (0.0) CalledNum=1157 (Ann8) CallingNum=5186973430 () Internal=0 Time=69511 AState=Connected
Call connects to ConsumerEndUser
62942833mS CD: CALL: 2.3.1 BState=Ringing Cut=1 Music=2.0 Aend="Line 2" (35.6) Bend="ConsumerEndUser(4409)" [] (0.0) CalledNum=4409 (ConsumerEndUser) CallingNum=5186973430 () Internal=0 Time=89220 AState=Connected
Call connects to Ann9
63002985mS CD: CALL: 2.3.1 BState=Idle Cut=1 Music=0.0 Aend="Line 2" (35.6) Bend="Ann9(1158)" [Ann9(1158)] (0.0) CalledNum=1158 (Ann9) CallingNum=5186973430 () Internal=0 Time=149372 AState=Connected
Caller apparently hangs up
63113511mS CMLOGGING: CALL:2009/05/0815:51,00:04:10,129,5186973430,I,1158,4192,,,,0,,""n/a,0
63113512mS CD: CALL: 2.3.1 BState=Connected Cut=2 Music=0.0 Aend="Line 2" (35.6) Bend="Ann9(1158)" [Ann9(1158)] (23.11) CalledNum=1158 (Ann9) CallingNum=5186973430 () Internal=0 Time=259898 AState=Idle
63113512mS CD: CALL: 2.3.1 Deleted