Re: [Linphone-developers] wrong NAT keep alive method over udp

[jehan . monnier]

Hi Philip,

You are right, CRLF are supposed to be for TCP only.

However CRLF keep alives are pretty simple and works with most SIP server.

If it’s not the case, you can still disabled keep alives using  linphone_core_keep_alive_enabled(LinphoneCore* lc) 

Best regards

Jehan

www.linphone.org

Le 19 juin 2017 à 20:57, Philip Morant <address@hidden> a écrit :

Hi,

I'm running linphone version 3.9.1-1231-gecda7e6 on Ubuntu, configured
to use UDP (through NAT).

I read in https://tools.ietf.org/html/rfc5626#section-4.4.1 that keep
alive with CRLF
" MUST only be used with connection oriented transports
  such as TCP or SCTP; it MUST NOT be used with connection-less
  transports such as UDP "
yet when I wireshark my calls (which abort roughly one in every 4
calls) I find that linphone is sending double CRLF keepalives over
UDP.

The code in static int send_keep_alive(belle_sip_channel_t* obj) in
listeningpoint.c appears to confirm this, since it sends a double CRLF
regardless of what transport is in use.

Please confirm / deny this analysis.

Thanks !

Philip

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