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 [email protected] http://lists.nongnu.org/mailman/listinfo/linphone-users
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