ISIP/2.0 486 Busy Here massage from Asterisk

I Have Asterisk and CUCM with SIP trunk connectivity and i am recording call of CUCM on Asterisk.

the Commen SIP trunk between CUCM and Asterisk for Call recording and Calling Between Phones.

the call are working fine but during call reecording asterisk give me Erro on CUCM which is "SIP/2.0 486 Busy Here"
find log from CUCM.
CUCM sending the invite message to Asterix server:
+++++++++++++++++++++++
00221934.001 |10:09:14.023 |AppInfo |//SIP/SIPUdp/wait_SdlSPISignal: Outgoing SIP UDP message to 172.18.14.3:[5060]:
[26936,NET]
INVITE sip:7777@172.18.14.3:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.14.8:5060;branch=z9hG4bKfbc62449779
From: “Ramlal Arya” sip:9020@172.18.14.8;x-farend;x-refci=27702702;x-nearendclusterid=StandAloneCluster;x-nearenddevice=SEP00EBD5CD6F64;x-nearendaddr=9020;x-farendrefci=27702703;x-farendclusterid=StandAloneCluster;x-farenddevice=Trunk-to-VEGA;x-farendaddr=9724014325;tag=12544~2930bcb9-2f1c-4270-ae7a-e869114004a2-27702714
To: sip:7777@172.18.14.3
Date: Tue, 15 Nov 2016 04:39:14 GMT
Call-ID: 747aca80-82a19172-f8c-80e12ac@172.18.14.8
Supported: timer,resource-priority,replaces
Min-SE: 1800
User-Agent: Cisco-CUCM10.5
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
CSeq: 101 INVITE
Expires: 180
Allow-Events: presence, kpml
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Cisco-Guid: 1954204288-0000065536-0000000045-0135140012
Session-Expires: 1800
P-Asserted-Identity: “Ramlal Arya” sip:9020@172.18.14.8
Remote-Party-ID: “Ramlal Arya” sip:9020@172.18.14.8;party=calling;screen=yes;privacy=off
Contact: sip:9020@172.18.14.8:5060;isFocus
Max-Forwards: 70
Content-Type: application/sdp
Content-Length: 199

v=0
o=CiscoSystemsCCM-SIP 12544 1 IN IP4 172.18.14.8
s=SIP Call
c=IN IP4 172.18.14.8
t=0 0
m=audio 25608 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
++++++++++++++++++++++++++++++++++++

Asterix sending Trying to CUCM:
+++++++++++++++++++++++++++++++++++
00221949.001 |10:09:14.027 |AppInfo |//SIP/SIPUdp/wait_SdlDataInd: Incoming SIP UDP message size 783 from 172.18.14.3:[5060]:
[26937,NET]
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 172.18.14.8:5060;branch=z9hG4bKfbc62449779;received=172.18.14.8;rport=5060
From: “Ramlal Arya” sip:9020@172.18.14.8;x-farend;x-refci=27702702;x-nearendclusterid=StandAloneCluster;x-nearenddevice=SEP00EBD5CD6F64;x-nearendaddr=9020;x-farendrefci=27702703;x-farendclusterid=StandAloneCluster;x-farenddevice=Trunk-to-VEGA;x-farendaddr=9724014325;tag=12544~2930bcb9-2f1c-4270-ae7a-e869114004a2-27702714
To: sip:7777@172.18.14.3
Call-ID: 747aca80-82a19172-f8c-80e12ac@172.18.14.8
CSeq: 101 INVITE
Server: FPBX-2.11.0(11.20.0)
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: sip:7777@172.18.14.3:5060
Content-Length: 0
+++++++++++++++++++++++++++++++++

Asterix sending Ringing to CUCM:
++++++++++++++++++++++++++++++++
00221951.001 |10:09:14.032 |AppInfo |//SIP/SIPUdp/wait_SdlDataInd: Incoming SIP UDP message size 799 from 172.18.14.3:[5060]:
[26938,NET]
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 172.18.14.8:5060;branch=z9hG4bKfbc62449779;received=172.18.14.8;rport=5060
From: “Ramlal Arya” sip:9020@172.18.14.8;x-farend;x-refci=27702702;x-nearendclusterid=StandAloneCluster;x-nearenddevice=SEP00EBD5CD6F64;x-nearendaddr=9020;x-farendrefci=27702703;x-farendclusterid=StandAloneCluster;x-farenddevice=Trunk-to-VEGA;x-farendaddr=9724014325;tag=12544~2930bcb9-2f1c-4270-ae7a-e869114004a2-27702714
To: sip:7777@172.18.14.3;tag=as6ec72b8c
Call-ID: 747aca80-82a19172-f8c-80e12ac@172.18.14.8
CSeq: 101 INVITE
Server: FPBX-2.11.0(11.20.0)
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: sip:7777@172.18.14.3:5060
Content-Length: 0
++++++++++++++++++++++++++++++

Asterix sending Busy Here to CUCM:
+++++++++++++++++++++++++++++
00221974.003 |10:09:14.192 |AppInfo |//SIP/SIPUdp/wait_SdlDataInd: Incoming SIP UDP message size 830 from 172.18.14.3:[5060]:
[26940,NET]
SIP/2.0 486 Busy Here
Via: SIP/2.0/UDP 172.18.14.8:5060;branch=z9hG4bKfbc62449779;received=172.18.14.8;rport=5060
From: “Ramlal Arya” sip:9020@172.18.14.8;x-farend;x-refci=27702702;x-nearendclusterid=StandAloneCluster;x-nearenddevice=SEP00EBD5CD6F64;x-nearendaddr=9020;x-farendrefci=27702703;x-farendclusterid=StandAloneCluster;x-farenddevice=Trunk-to-VEGA;x-farendaddr=9724014325;tag=12544~2930bcb9-2f1c-4270-ae7a-e869114004a2-27702714
To: sip:7777@172.18.14.3;tag=as6ec72b8c
Call-ID: 747aca80-82a19172-f8c-80e12ac@172.18.14.8
CSeq: 101 INVITE
Server: FPBX-2.11.0(11.20.0)
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
X-Asterisk-HangupCause: User busy
X-Asterisk-HangupCauseCode: 17
Content-Length: 0
+++++++++++++++++++++++++++

CUCM ACK to Asterix Busy Here message:
+++++++++++++++++++++++++++
00221976.001 |10:09:14.193 |AppInfo |//SIP/SIPUdp/wait_SdlSPISignal: Outgoing SIP UDP message to 172.18.14.3:[5060]:
[26941,NET]
ACK sip:7777@172.18.14.3:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.14.8:5060;branch=z9hG4bKfbc62449779
From: “Ramlal Arya” sip:9020@172.18.14.8;x-farend;x-refci=27702702;x-nearendclusterid=StandAloneCluster;x-nearenddevice=SEP00EBD5CD6F64;x-nearendaddr=9020;x-farendrefci=27702703;x-farendclusterid=StandAloneCluster;x-farenddevice=Trunk-to-VEGA;x-farendaddr=9724014325;tag=12544~2930bcb9-2f1c-4270-ae7a-e869114004a2-27702714
To: sip:7777@172.18.14.3;tag=as6ec72b8c
Date: Tue, 15 Nov 2016 04:39:14 GMT
Call-ID: 747aca80-82a19172-f8c-80e12ac@172.18.14.8
User-Agent: Cisco-CUCM10.5
Max-Forwards: 70
CSeq: 101 ACK
Allow-Events: presence, kpml
Content-Length: 0
++++++++++++++++++++++++++

Please help me with the solution

You would need to provide the Asterisk console log in order to know what Asterisk is doing with the request and why it is sending 486 back.