Created new trunk 4001 with same options contact and prefix and sent a call to SIP Server from XLite phone and observed below events in SIP Server logs
ACK sip:4001@192.168.50.110:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.50.112:5065;branch=z9hG4bKAD13E65F-B828-4D42-A901-C37DAD6048C5-8
From: sip:87654@192.168.50.112:5065;tag=AFDF116B-066E-4C3F-80CC-13F9078E9CB4-16
To: <sip:4001@192.168.50.112:5065>;tag=A8BA40B0-5367-446E-0292-78C1E5A05EAC
Call-ID: 1020B806-D34F-4048-A85F-A25641F6F5B6-8@192.168.50.112
CSeq: 1 ACK
Max-Forwards: 69
User-Agent: X-Lite release 4.5.3 stamp 70569
Content-Length: 0
23:06:03.965: SipDialog: event CALLING_RESREJECT, t=9003, s=9, r=5, m=000000000313be08
23:06:03.965 SIPCONN(4001): HandleSipDialogEvent(CALLING_RESREJECT)
23:06:03.965 SIPCONN(4001): ConvertResponse: 480
23:06:03.965 SIPCONN(4001): ConvertResponse: no conversion configured for 480
23:06:03.965 SIPCONN(4001): state e:4,p:0,s:6,c:10,rc:480,m:1
23:06:03.965 SIPPARTY(4001): 1016 verify update of party-connection state N-F
23:06:03.965 SIPPARTY(4001): 1016 update party-connection state N-F
23:06:03.965: check call postponed until end of operation
23:06:03.965 SIPCONN(4001): terminate dialog
23:06:03.965: SipDialog: set monitor 0000000000000000
23:06:03.965: SipDialog::Terminate(state=9,reason=0)
23:06:03.965 SIPCONN(4001): state e:4,p:6,s:6,c:10,rc:480,m:1
23:06:03.965 SIPPARTY(4001): 1016 verify update of party-connection state F-F
23:06:03.965: SIPTR(68): failed
23:06:03.965: SIPTR(63): Step 4 - SipTransactionConnectNewParty(68) failed
23:06:03.965: SIPTR(63): failed
23:06:03.965: SIPCM: transaction SipScenario failed
23:06:03.965: PI: 00 S[IN]D[87654]C[*D[87654]]P[4001]
23:06:03.965: PI: 01 S[FN]D[4001]P[87654], busy scheduled
23:06:03.965: party cannot be recovered
23:06:03.965: CALLSTATE(a:2,d:0,i:0,e:2,r:0,o:0)
23:06:03.965: apply fast busy tone for device '4001'
23:06:03.965: ERROR: No treatment services are configured
23:06:03.965: ERROR: 1000001d, GetDeviceManager().ResolveServiceDevice(call, SIP_MEDIA_SERVICE_MUSIC, geoLocation.CStr(), result), SipMediaResourceManager.cpp,183
23:06:03.965: ERROR: 1000001d, CreateMusicDevice(context, call, party, endPoint, type, device), SipMediaResourceManager.cpp,197
23:06:03.965: ERROR: 1000001d, CreateMusicServiceInternal(context,call,party,type,endPoint,musicService), SipMediaResourceManager.cpp,242
23:06:03.965: cannot create music service 4
23:06:03.965: cannot attach busy tone. Please check configuration.
23:06:03.965: cannot apply tone, re-check the call
23:06:03.965: previous scenario is not cleaned up
23:06:03.965: SIPTR(63): Begin step 0 - SipTransactionRejectCall(69)
23:06:03.965 SIPCONN(87654): re-invite-called-initiated
23:06:04.012: Sending [0,UDP] 486 bytes to 192.168.50.33:26606 >>>>>
SIP/2.0 480 Temporarily not available
Via: SIP/2.0/UDP 192.168.50.33:26606;branch=z9hG4bK-d8754z-ec94f27cc3f2726f-1---d8754z-;rport;received=192.168.50.33
To: "4001"<sip:4001@192.168.50.112:5065>;tag=AFDF116B-066E-4C3F-80CC-13F9078E9CB4-15
From: <sip:87654@192.168.50.112:5065>;tag=794ac743
Call-ID: NjRmMjZlYjI3MDM0MzUyZjgyYjQxODljNWRhMWQ3YzA
CSeq: 1 INVITE
Warning: 399 192.168.50.110 "No matching resources for this service type [Service Type: voicexml]"
Content-Length: 0