Alright, I looked at monitor on the phone system that has the SIP Trunking and this is what I got:
IE CMIERespondingPartyNumber (230)(P:100 S:100 T:0 N:100 R:4) number=93792074
IE CMIEDeviceDetail (231) LOCALE=enu HW=8 VER=4 class=CMDeviceSIPTrunk type=0 number=16 channel=0 rx_gain=32 tx_gain=32 ep_callid=1381 ipaddr=70.43.124.10 apps=0
10246756mS CMARS: LINE ep Received: CMProceeding - child->state = CMCSOffering - ARS Call State = CMCSOverlapRecv
10246756mS CMARS: LINE IS NOW THE B END OF THE CALL - CMARSEndpoint::RequestEnd()
10246757mS CMARS: CMARSEndpoint::CallLost(cause=124) - Address: 0.1380.0 105 ARS for [9] - Call State: CMCSOverlapRecv
10246757mS CMCallEvt: 0.1380.0 -1 ARS for [9]: StateChange: END=X CMCSOverlapRecv->CMCSDelete
10246758mS CMCallEvt: 16.1381.0 105 SIPTrunk Endpoint: StateChange: END=B CMCSOffering->CMCSAccept
10246760mS CMLineTx: v=9
CMFacility
Line: type=IPLine 9 Call: lid=9 id=39 in=1
IE CMIEFastStartInfoData (6)
10246761mS CMLineTx: v=9
CMProceeding
Line: type=IPLine 9 Call: lid=9 id=39 in=1
IE CMIERespondingPartyNumber (230)(P:100 S:100 T:0 N:100 R:4) number=93792074
IE CMIEDeviceDetail (231) LOCALE=enu HW=8 VER=4 class=CMDeviceSIPTrunk type=0 number=16 channel=0 rx_gain=32 tx_gain=32 ep_callid=1381 ipaddr=70.43.124.10 apps=0
10246762mS CMCallEvt: 0.1380.0 -1 BaseEP: DELETE CMEndpoint fe92d8a8 TOTAL NOW=2 CALL_LIST=1
10246765mS H323Evt: v=0 stacknum=9 State, new=ICProceeding, old=OverlapRecv id=39
10246773mS SIP Rx: UDP 74.223.147.141:5060 -> 70.43.124.10:5060
SIP/2.0 480 Temporarily not available
Via: SIP/2.0/UDP 70.43.124.10:5060;branch=z9hG4bK6436c8478ab799d33d747380eef2e970;rport=5060
From: "8432085219" <sip:8432085219@74.223.147.141>;tag=81ac37422525d29c
To: <sip:3792074@74.223.147.141>;tag=gK098c0904
Call-ID: c3ab5c6ff114893b8f9f74b25dab876e@70.43.124.10
CSeq: 1998100915 INVITE
Content-Length: 0
10246778mS SIP Tx: UDP 70.43.124.10:5060 -> 74.223.147.141:5060
ACK sip:3792074@74.223.147.141 SIP/2.0
Via: SIP/2.0/UDP 70.43.124.10:5060;rport;branch=z9hG4bK6436c8478ab799d33d747380eef2e970
From: "8432085219" <sip:8432085219@74.223.147.141>;tag=81ac37422525d29c
To: <sip:3792074@74.223.147.141>;tag=gK098c0904
Call-ID: c3ab5c6ff114893b8f9f74b25dab876e@70.43.124.10
CSeq: 1998100915 ACK
Max-Forwards: 70
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, INFO
Content-Length: 0
10246779mS CMLineRx: v=0
CMReleaseComp
Line: type=IPLine 16 Call: lid=16 id=1381 in=0
IE CMIERespondingPartyNumber (230)(P:100 S:100 T:0 N:100 R:4) number=93792074
The 480 Temporarily Unavailable is the key error message I guess,