o vpn nera galimybes pakurt? ir desi skersa ant nat

On 2012.02.23 20:11, ccc wrote:
> Kas susidures, kokios praktikos, kaip ten su IP adresais. Kiekvienam
> VOIP aparatui isoriniu IP adresu nesinoretu pirkti...
> Yra stotele su voip ir 5 voip telefonai. Skambinti skambina, bet nera
> garso. Problemos aprasymas:
>
> "The Trouble with NAT and VOIP
> In addition, the way in which conventional VoIP protocols are designed
> is also posing a problem to VoIP traffic passing through NAT.
> Conventional VoIP protocols only deal with the signalling of a telephone
> connection. The audio traffic is handled by another protocol and to make
> matters worse, the port on which the audio traffic is sent is random.
> The NAT router may be able to handle the signalling traffic, but it has
> no way of knowing that the audio traffic is related to the signalling
> and should hence be passed to the same device the signalling traffic is
> passed to. As a result, the audio traffic is not translated properly
> between the address spaces.
>
> At first, for both the calling and the called party everything will
> appear just fine. The called party will see the calling party's Caller
> ID and the telephone will ring while the calling party will hear a
> ringing feedback tone at the other end. When the called party picks up
> the telephone, both the ringing and the associated ringing feedback tone
> at the other end will stop as one would expect. However, the calling
> party will not hear the called party (one way audio) and the called
> party may not hear the calling party either (no audio).
>
> The issue of NAT Traversal is a major problem for the widespread
> deployment of VOIP. Yet, the issue is non-trivial and there are no
> simple solutions. In general terms there are two ways to deal with this
> problem:
>
> avoid the problem altogether
> working around the problem"
> http://www.voip-info.org/wiki/view/NAT+and+VOIP
>
> Jei butu tik vienas voip aparatas, tuomet puiku. Idedi I DMZ ir tiek
> ziniu, bet ju yra daugiau.
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