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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