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Re: [Linphone-developers] Two Linphones behind same NAT

From: Simon Morlat
Subject: Re: [Linphone-developers] Two Linphones behind same NAT
Date: Wed, 16 May 2007 22:26:01 +0200
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Nats are a nigthmare for SIP.
I agree with you.
Point 1 is now on the TODO list
Point 2 is now in the FAQ.

Thanks !


Le lundi 14 mai 2007 10:35, Conrad Beckert a écrit :
> Hi,
> We run an Asterisk server at the office we connect our phones to. I have a
> small network at home which shares a single internet connection by a NAT
> router.
> Linphone works like a charme in this environment (which includes an SIP ATA
> box for analog phones) unless I open it on more than one machine. If I do
> so, I can still issue calls but recieving calls fails -> no sound
> (interestingly video works) there is also no counfusion about the
> signalling.
> Anyway. The reason seems to be that unlike other softphones Linphone
> occupies fixed UDP ports for SIP signalling and RTP. So I changed those
> ports in the config and everything was fine.
> Actually - I came to this idea because I deal a lot with VoIP and NAT (on
> H323 with all the Netmeetings, OpenPhones, etc..)
> 1.
> Anyway - it seems to be that dynamic allocation of RTP ports - despite its
> unfriendlyness to firewalls has its advantages (at least to be able to give
> a range to chose from)
> 2.
> Before the software can handle this, we should put this info in the FAQ of
> the website. :-)
> Greetings from Berlin
> Conrad
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