Linphone 3.3.2 sends UDP packets of length 4, containing double CRLF
assume as keep alive method. These are invalid SIP packets, since a
double CRLF is only ignored by a SIP server when received over
connection oriented transport protocols like TCP and STCP.
An alternative keep alive method should be used instead, preferably
OPTIONS when needed.
http://tools.ietf.org/html/rfc5626#section-3.5.1
Regards,
Mikael
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