<--- SIP read from UDP:212.27.52.5:5060 --->
SIP/2.0 501 Not Implemented Yet
Call-ID: 3fa7ac8833467dc6795049142f6bf161@192.168.1.6
CSeq: 102 OPTIONS
From: "Unknown" <sip:Unknown@192.168.1.6>;tag=as65738016
To: <sip:freephonie.net>;tag=00-30925-04424c8c-4f6124f54
Via: SIP/2.0/UDP 192.168.1.6:5060;received=62.147.138.200;rport=506 0;branch=z9hG4bK1e6e9abd
Content-Length: 0
<------------->
--- (7 headers 0 lines) ---
Really destroying SIP dialog '3fa7ac8833467dc6795049142f6bf161@192.168.1.6' Method: OPTIONS

<--- SIP read from UDP:213.215.45.230:5060 --->
OPTIONS sip:62.147.138.200:5060 SIP/2.0
Via: SIP/2.0/UDP 213.215.45.230:5060;branch=0
From: sip:pinger@ippi.fr;tag=08b218a1
To: sip:62.147.138.200:5060
Call-ID: 2e9df1e4-4540d6e4-d3a44@213.215.45.230
CSeq: 1 OPTIONS
Content-Length: 0

que veut dire tous ça ?