here is the log - seems like an invite to 207.223.64.238 but its not handled correctly by asterisk.. adter a couple of these i get BYE packet

<--- SIP read from UDP:67.228.182.2:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP 209.141.60.170:5060;branch=z9hG4bK68e82078;rport=5 060
Record-Route: <sip:199.96.248.140;lr=on>
Record-Route: <sip:67.228.182.4;lr=on;ftag=as7ad374a3;did=eed.df 0edbc2>
Record-Route: <sip:67.228.182.2;lr=on;ftag=as7ad374a3>
From: <sip:[MY NUMBER]@67.228.182.2>;tag=as7ad374a3
To: <sip:18009993355@sip.voipwelcome.com>;tag=4KZ3y302 QB8cQ
Call-ID: 5bd2cbb16e7ca39a26fe37f702223775@209.141.60.170
CSeq: 103 INVITE
Contact: <sip:18009993355@67.228.182.4:5060;transport=udp >
User-Agent: AlcazarSBC 1.10
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, NOTIFY
Supported: timer, precondition, path, replaces
Allow-Events: talk, hold, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 228

v=0
o=Sonus_UAC 22892 27655 IN IP4 207.223.64.238
s=SIP Media Capabilities
c=IN IP4 207.223.64.133
t=0 0
m=audio 12176 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=maxptime:20


here is the good bye packet

<--- SIP read from UDP:67.228.182.2:5060 --->
BYE sip:2015417796@209.141.60.170 SIP/2.0
Record-Route: <sip:67.228.182.2;lr=on;ftag=cccgpH48H6QZD>
Record-Route: <sip:67.228.182.4;lr=on;ftag=cccgpH48H6QZD>
Via: SIP/2.0/UDP 67.228.182.2;branch=z9hG4bK5b84.8f30e3b3.0
Via: SIP/2.0/UDP 67.228.182.4;rport=5060;branch=z9hG4bK5b84.97c9725 2.0
Via: SIP/2.0/UDP 199.96.248.140;rport=5060;branch=z9hG4bK5b84.7c1b4 212.0
Via: SIP/2.0/UDP 10.1.50.24:5004;rport=5004;branch=z9hG4bK8ZNg97XQ8 pSZm
Max-Forwards: 67
From: <sip:my number@67.228.182.2>;tag=cccgpH48H6QZD
To: <sip:my number@67.228.182.2>;tag=as2ede53d4
Call-ID: 188a230d02f16aa922f2a83c3e415221@209.141.60.170
CSeq: 28145080 BYE
Contact: <sip:18009993355@67.228.182.4:5060;transport=udp >
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, NOTIFY
Reason: SIP;cause=408;text="ACK Timeout"
Content-Length: 0
P-Asserted-Identity: <sip:MY Number@67.228.182.2>