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From: | Klaus Darilion |
Subject: | Re: [Linphone-users] Truncated response to SIP Options message |
Date: | Thu, 20 May 2010 19:04:09 +0200 |
User-agent: | Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.1.9) Gecko/20100317 Thunderbird/3.0.4 |
Hi Keith! Those 4 bytes are probably CRLFCRLF and are used as light-weight keep-alive.Actually CRLF keep alive over UDP is not standardized, but it is a defacto-standard implemented by many client and supported by almost any server software.
regards Klaus Am 20.05.2010 16:50, schrieb Keith Jacobs:
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 _______________________________________________ Linphone-users mailing list address@hidden http://lists.nongnu.org/mailman/listinfo/linphone-users
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