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Re: [Linphone-users] Re: linphone access when a firewall is involved...


From: Simon Morlat
Subject: Re: [Linphone-users] Re: linphone access when a firewall is involved...
Date: Tue, 27 Jun 2006 15:11:30 +0200
User-agent: KMail/1.9.1

Le lundi 19 juin 2006 17:16, Petr Pisar a écrit :
> Simon Morlat wrote:
> > SIP and RTP use UDP not TCP.
>
> This is not true. According to RFC every SIP implementation has to
> support SIP over TCP. Clients are also supposted to be ready to recieve
> SIP message over TCP even if previous message of dialogue comes via UDP.
> This is because of client should use TCP instead of UDP if the message
> lenght is larger then MTU - (cca) 200 B.
>
> -- Petr

You are right. I did not notice that in RFC3261. In practice, since RTP can 
only use UDP, I don't see the interest of using TCP/SIP in a audio-video 
phone.

Simon

>
> > Le mercredi 14 juin 2006 21:39, William Bulley a écrit :
> >> I have installed linphone 1.3.5 on two FreeBSD 6.1 machines
> >> and demonstrated that it works as advertised on my local
> >> (private) LAN between those two systems using non-routeable,
> >> RFC-1918 (net ten) IP addresses.  When I try to use linphone
> >> across the Internet to another FreeBSD 6.1 user also running
> >> linphone 1.3.5 (both of us have firewalls), it does not work
> >> as advertised.  We are able to connect using SIP and to chat
> >> in the chat window (ASCII text only), so I do know that both
> >> linphone configurations are correct at least for SIP.  However,
> >> no RTP audio works between the two instances: my local linphone
> >> and the remote (to me) user's linphone.
> >>
> >> Both of our firewalls have been configured to allow inbound
> >> access from any source to our local LAN machines for both
> >> the SIP protocol (on TCP port 5060) and the RTP protocol (on
> >> TCP port 7078).  Since the complete linphone application is
> >> known to work on my local LAN between two local machines, I
> >> am suspecting that something is amiss with the configuration
> >> of the firewall on my end or the firewall on the other end.
> >>
> >> I can give further details of my firewall setup if needed,
> >> but I thought I might ask here first if there is something
> >> else that I need to check.  Maybe I am missing something
> >> obvious (but not to a new user of linphone) that is simple
> >> to correct.  Thanks!
> >>
> >> Regards,
> >>
> >> web...
> >>
> >> --
> >> William Bulley                     Email: address@hidden
> >>
> >>
> >>
> >> _______________________________________________
> >> Linphone-users mailing list
> >> address@hidden
> >> http://lists.nongnu.org/mailman/listinfo/linphone-users
>
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