PBX is  Avaya .
Error snippet - 
@20:02:31.1184 [asai] AgentLogin [XXXXXXXXX,id,sLO] (reqAgentLogin)
	TP_AsaiData
	REGISTER  CRV:3613
	Facility: INVOKE
	InvokeId: 3
	Operation: FeatureRequest
	UserEnteredCode: LoginDigits t/o=64, 'XXXXXXX#XXXXXX'
	Feature: Login
	Domain: (ACD_Split),'00'
	Domain: (Extension),'XXXXXXX'
	Domain: (WorkMode),1
	
	@20:02:31.1184 [>>] 08 00 00 3D 08 02 36 13 64 96 1C 35 91 A1 32 02 01 03 02 01 8F 40 2A 96 02 11 82 C0 31 31 36 33 35 39 35 23 31 31 36 33 35 39 B5 48 01 82 49 03 81 30 B0 49 08 83 31 30 32 32 38 38 B5 49 02 86 81 
@20:02:31.1205 [<<] 08 00 00 17 08 02 B6 13 5A 96 1C 0F 91 A3 0C 02 01 03 02 01 8F 40 04 08 02 E1 8F 
	TP_AsaiData
	RELEASE_COMPLETE  CRV:b613
	Facility: RETURN_ERROR
	InvokeId: 3
	Error: 143
	Cause: A_NOLOGIN
@20:02:31.1205 [asai] (processFacilityReturnError)
@20:02:31.1206 [gctmi] request RequestAgentLogin ctiRefId 13843 deactivated in reqMgr
@20:02:31.1206 [gctmi] TMsg [EventError()] distributing to model
@20:02:31.1206 [gctmi] AgentLogin [XXXXXXXX,id,sLO] distributing EventError
@20:02:31.1206 [gctmi] AgentLogin [XXXXXXXXX,id,sLO] processError
@20:02:31.1207 [gctmi] request RequestAgentLogin ctiRefId 13843 removed from reqMgr
@20:02:31.1207 [0] 8.1.001.19 send_to_client: message EventError
	(Agent not logged in to split)
	AttributeEventSequenceNumber	00000000083fb1df
	AttributeCustomerID	'Resources'
	AttributeTimeinuSecs	120724
	AttributeTimeinSecs	1407441751 (20:02:31)
	AttributeErrorCode	613
	AttributeThisDN	'XXXXXXX'
	AttributeReferenceID	3