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[Linphone-users] Truncated response to SIP Options message

From: Keith Jacobs
Subject: [Linphone-users] Truncated response to SIP Options message
Date: Thu, 20 May 2010 15:50:54 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.9) Gecko/20100317 Thunderbird/3.0.4
Whilst sniffing the traffic between several hundred Linphone endpoints and an Asterisk server I see that whenever the Asterisk sends out a 'SIP Options' message to any client, the client first responds with an invalid SIP message (to port 5060 but only 4 bytes of data) followed by a correct response some 10ms later. Does anyone know what this is all about? Can it be stopped? 

Thanks
Keith
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