Obitalk service protocol and VoIP without SIP
ianobi:
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To sum up your post, there is no way around if SIP protocol itself is being blocked?
I'm not an expert on protocols. SIP is common, but there are others. For example, Google Voice uses XMPP. IAX is another and H.323. H.323 is rarely used now as far as I know.
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Is there any way to use Obitalk service without connecting to Obitalk servers (that's obviously the weak point if ISP wants to block them)?
Not as far as I know.
Ostracus:
Well a VPN doesn't require a "provider". It can be between two routers, one set as a client, the other as a server.
One can also use EoIP routing as well although I'm not certain about the security aspect.
For those who don't know EoIP is basically bridging two LANs together over a WAN connection. One could pretend two or more Obidevices are on the same LAN.
I believe RonR already has an example of two Obidevices connecting directly to each other over a LAN.
Toulousaing:
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Well a VPN doesn't require a "provider". It can be between two routers, one set as a client, the other as a server.
Yes I mentioned above about VPN home routers as a solution because I don't want to use VPN providers. And VPN home routers means extra complexity (set-up, +1 VPN router for each Obi end) and more importantly extra bandwith (some of my Obi ends have low bandwith internet access).
I have strong requirements: "low-bandwith-compatibility", and "censorship-proofness".
And "soft" requirements: low complexity (using only Obi ends/any other ATA/IP phone would be good), and stability over time.
Concerning EoIP solution, I guess that I can't avoid the set up of a router behind each Obi end.
But what is the overall required bandwith using codecs like G729 (which has low required bandwith)?
If this is comparable to that of VPN, then I guess it is not worth investing in that solution.
NB1: I'm not asking to help me to breach any law, as some ISP do it without any supporting law, i.e. THEY are on illegal side.
NB2: I don't really care about security. And if they go to that point, it means they're really after me, in which case they'd decode my VPN communications anyway and I guess they have the means. But I really don't think I'm a valuable target ;D Their purpose is just to force you to use their paid service...
Ostracus:
What kind of links are we talking about? DSL? Cellular? VoIP in itself doesn't take much unless you're going HD. Robustness is as good as the underlying link.
Toulousaing:
sorry for late answer.
Actually, it's a DSL link with very poor bandwith, branded as 128kbps, 256kbps or 512kbps depending on Obi end. But I think that none of them goes beyond 80kbps (if I remember well). Anyway, when I tested the g.711u using best of those links, voice was choppy/broken... Only tests with g.726-16 and g.729 were satisfactory. That's why I'm quite reluctant to try VPN.
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