It's a GVP integration mode throught IVR Server.
a IVR port can got eventringing, but after that, hang up, there is an EventDesitnationBusy error.
there are a lot of error msg "Unable to resolve number for DN:GVP"," Gateway for address '10.36.141.193', number 'GVP' is not found." in sip log.
Is this GVP DN a default DN? do I have to create it? does it have anything to do with the error "EventDesitnationBusy "

below is the related SIP log.
any thoughts?
thanks in advance.
11:08:57.852: $+NET:SIP::0:0
11:08:57.853: SIPTR: Received [0,UDP] 408 bytes from 10.36.141.193:5064 <<<<<
OPTIONS sip:10.36.141.192:5060 SIP/2.0
Via: SIP/2.0/UDP 10.36.141.193:5064;branch=z9hG4bK0000000019A774E0325309
[size=14pt][b]From: <sip:GVP@10.36.141.193:5064>;tag=21E60A5E-6099-4A94-D9A3-08BE55CA5CE4[/b][/size]
To: sip:10.36.141.192:5060
Max-Forwards: 70
CSeq: 510323 OPTIONS
Call-ID: 529C016A-4EF6-4846-C7A9-44741B8A0756-5064@10.36.141.193
Contact: <sip:GVP@10.36.141.193:5064>
Content-Length: 0
Supported: timer, uui
11:08:57.853: Unable to resolve number for DN:GVP
11:08:57.853: Unable to resolve number for DN:GVP
11:08:57.853: trunk ip addr 10.36.141.193
11:08:57.853 Std 52002 Gateway for address '10.36.141.193', number 'GVP' is not found.
11:08:57.853: Sending [0,UDP] 327 bytes to 10.36.141.193:5064 >>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.36.141.193:5064;branch=z9hG4bK0000000019A774E0325309;received=10.36.141.193
From: <sip:GVP@10.36.141.193:5064>;tag=21E60A5E-6099-4A94-D9A3-08BE55CA5CE4
To: sip:10.36.141.192:5060
CSeq: 510323 OPTIONS
Call-ID: 529C016A-4EF6-4846-C7A9-44741B8A0756-5064@10.36.141.193
Content-Length: 0
11:08:57.853: $-NET:SIP::0:511
11:08:58.846: $+NET:SIP::0:0
11:08:58.846: SIPTR: Received [0,UDP] 408 bytes from 10.36.141.193:5064 <<<<<
OPTIONS sip:10.36.141.192:5060 SIP/2.0
Via: SIP/2.0/UDP 10.36.141.193:5064;branch=z9hG4bK000000001A0F01E032530a
From: <sip:GVP@10.36.141.193:5064>;tag=D1970905-B329-4A08-4C83-838855EA3C4A
To: sip:10.36.141.192:5060
Max-Forwards: 70
CSeq: 510328 OPTIONS
Call-ID: 5C8D049F-03CA-49ED-6099-6D21C24A03A7-5064@10.36.141.193
Contact: <sip:GVP@10.36.141.193:5064>
Content-Length: 0
Supported: timer, uui
11:08:58.846: Unable to resolve number for DN:GVP
11:08:58.846: Unable to resolve number for DN:GVP
11:08:58.846: trunk ip addr 10.36.141.193
11:08:58.846 Std 52002 Gateway for address '10.36.141.193', number 'GVP' is not found.
11:08:58.846: Sending [0,UDP] 327 bytes to 10.36.141.193:5064 >>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.36.141.193:5064;branch=z9hG4bK000000001A0F01E032530a;received=10.36.141.193
From: <sip:GVP@10.36.141.193:5064>;tag=D1970905-B329-4A08-4C83-838855EA3C4A
To: sip:10.36.141.192:5060
CSeq: 510328 OPTIONS
Call-ID: 5C8D049F-03CA-49ED-6099-6D21C24A03A7-5064@10.36.141.193
Content-Length: 0
11:08:58.846: $-NET:SIP::0:459
11:08:59.853: $+NET:SIP::0:0
11:08:59.853: SIPTR: Received [0,UDP] 408 bytes from 10.36.141.193:5064 <<<<<
OPTIONS sip:10.36.141.192:5060 SIP/2.0
Via: SIP/2.0/UDP 10.36.141.193:5064;branch=z9hG4bK000000001A0EF9A032530b
From: <sip:GVP@10.36.141.193:5064>;tag=A9445E71-5094-430E-8EAF-AE93A02A349D
To: sip:10.36.141.192:5060
Max-Forwards: 70
CSeq: 510333 OPTIONS
Call-ID: 5EFED0A2-D90A-4B67-68AD-65C04E3B6289-5064@10.36.141.193
Contact: <sip:GVP@10.36.141.193:5064>
Content-Length: 0
Supported: timer, uui
[b][size=12pt][color=red]11:08:59.853: Unable to resolve number for DN:GVP
11:08:59.853: Unable to resolve number for DN:GVP[/color][/size][/b]
11:08:59.853: trunk ip addr 10.36.141.193
[color=red][b]11:08:59.853 Std 52002 Gateway for address '10.36.141.193', number 'GVP' is not found.[/b][/color]
11:08:59.853: Sending [0,UDP] 327 bytes to 10.36.141.193:5064 >>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.36.141.193:5064;branch=z9hG4bK000000001A0EF9A032530b;received=10.36.141.193
From: <sip:GVP@10.36.141.193:5064>;tag=A9445E71-5094-430E-8EAF-AE93A02A349D
To: sip:10.36.141.192:5060
CSeq: 510333 OPTIONS
Call-ID: 5EFED0A2-D90A-4B67-68AD-65C04E3B6289-5064@10.36.141.193
Content-Length: 0
11:08:59.853: $-NET:SIP::0:469
11:09:00.732: $+NET:SIP::0:0
11:09:00.732: SIPTR: Received [0,UDP] 882 bytes from 10.36.141.193:5060 <<<<<
SIP/2.0 480 Temporarily Unavailable
Via: SIP/2.0/UDP 10.36.141.192:5060;branch=z9hG4bKFC41DA6E-D364-4C67-A458-FB5285D1C7A6-33
From: sip:4001@10.36.141.192:5060;tag=7D2A1C3D-D914-4610-B03A-F02556A1F858-26
To: <sip:12001@10.36.141.192:5060>;tag=456458A8-A689-4536-2DB5-A2EA038547BE
CSeq: 1 INVITE
Call-ID: 248C1375-1D32-4C37-9F7A-0E8A45D1C9F5-14@10.36.141.192
Contact: sip:CTIConnector@10.36.141.193:5080
Content-Length: 0
Record-Route: <sip:000000000D54F1B0@10.36.141.193:5060;lr;gvp.rm.datanodes=1;idtag=00000031>
X-Genesys-GVP-Session-ID: 18C214C9-FD60-4F6A-DFBF-069B3A3E52BF;gvp.rm.datanodes=1;gvp.rm.cti-call=1
X-Genesys-GVP-CDR: CALL-DISPOSITION=0;QUEUE-WAIT-TIME=0.000000
X-Genesys-CallInfo: routed
X-Genesys-CallUUID: E8OI3STMD150NCD4SM8SOM7A88000008
X-Genesys-GVP-Session-Data: callsession=18C214C9-FD60-4F6A-DFBF-069B3A3E52BF;1;0;;sip:10.36.141.193:5080;;;;
11:09:00.732: Sending [0,UDP] 451 bytes to 10.36.141.193:5060 >>>>>
ACK sip:30019@10.36.141.193:5060 SIP/2.0
Via: SIP/2.0/UDP 10.36.141.192:5060;branch=z9hG4bKFC41DA6E-D364-4C67-A458-FB5285D1C7A6-33
From: sip:4001@10.36.141.192:5060;tag=7D2A1C3D-D914-4610-B03A-F02556A1F858-26
To: <sip:12001@10.36.141.192:5060>;tag=456458A8-A689-4536-2DB5-A2EA038547BE
Call-ID: 248C1375-1D32-4C37-9F7A-0E8A45D1C9F5-14@10.36.141.192
CSeq: 1 ACK
Max-Forwards: 69
User-Agent: X-Lite release 1100l stamp 47546
Content-Length: 0
11:09:00.732: SipDialog: event CALLING_RESREJECT, t=1694, s=9, r=5, m=00000000040a0788
11:09:00.732 SIPCONN(30019): HandleSipDialogEvent(CALLING_RESREJECT)
11:09:00.732 SIPCONN(30019): 1pcc event CALLING_RESREJECT
11:09:00.732 SIPCONN(30019): ConvertResponse: 480
11:09:00.732 SIPCONN(30019): ConvertResponse: no conversion configured for 480
11:09:00.733 SIPCONN(30019): state e:4,p:2,s:6,c:10,rc:480,m:1
11:09:00.733 SIPPARTY(30019): 24 verify update of party-connection state A-F
11:09:00.733 SIPPARTY(30019): 24 update party-connection state A-F
11:09:00.733 +++ CIFace::Event +++
+++ Pre-event +++
Type EventDestinationBusy
Devices: <4001/4001> <30019/30019> <-/->
Calls: 8/00700212bebaa008/8.04016330/c:2/r:1 0/none
Parties: D4001/4001.03f10af0-04016330:1/l:1/r:0/Dialing,Active,Origination
D30019/30019.035548a0-04016330:1/l:2/r:0/Alerting,DNull,Destination
none
Cause: Busy/3, Info: 0
Flags: divert=0 hook=0 postCall=0 active=1 moveAll=1 callType=1 hideOtherPi=0 InternalOther=1
--- Pre-event ---
+++ DestBusy +++
-- target state not compatible at line 1174
SetFailed: party 4001.03f10af0-04016330:1, cause Busy
@11:09:00.7330 [0] 8.1.000.79 [size=12pt][b]distribute_event: message EventDestinationBusy[/b][/size]
AttributeEventSequenceNumber 000000000000124a
AttributeTimeinuSecs 733000
AttributeTimeinSecs 1345475340 (11:09:00)
AttributeExtensions [23] 00 01 01 00..
'BusinessCall' 0
AttributeOtherDNRole 2
AttributeOtherDN '30019'
AttributeThisDNRole 1
AttributeThisDN '4001'
AttributeCustomerID 'Resources'
AttributeDNIS '12001'
AttributeUserData [567] 00 17 00 00..
'userdata1' 'test1'