[tor-talk] Tor VoIP PBX Architecture Discussion

[Conrad Rockenhaus]

Iain,

If it were to be offered as a non-hidden service, what about the UDP portion of the VoIP services, or do we just force everything to be TCP?

Thanks,

Conrad

> On Oct 22, 2018, at 11:13 AM, Iain Learmonth <irl at torproject.org> wrote:
> 
> Signed PGP part
> Hi Conrad,
> 
> On 20/10/18 06:07, Conrad Rockenhaus wrote:
>> 4)	Results of a test were conducted and one second round trip latency was noticed from PSTN to a soft phone connected via Tor (via OpenVPN). Hopefully performance improvement will be noticed with OnionCat.
> 
> Tor Metrics has some data on average latencies for client to Onion
> service. This is your absolute minimum latency, with the only way to
> reduce this being to have latency-aware path selection or to reduce
> latencies on the Internet (e.g. by swapping fibre for copper or copper
> for microwave).
> 
> https://metrics.torproject.org/onionperf-latencies.html
> 
> You get benefit from using an Onion Service over using an exit in that
> you're using less constrained resources (exits are scarce) but you also
> add extra hops to your circuit. For now, these extra hops do increase
> latency. Configuring your onion service to not be location hidden would
> improve this.
> 
> It would be interesting to see what kind of overheads are added by
> OnionCat, but I see that this is a project that has an end in sight
> unless someone comes up with a way to make it work with v3 Onion
> Services. IPv6 addresses are not long enough to encode keys into to make
> them self-authenticating. Either we need IPv7 or perhaps some
> Onion-native network layer or something else.
> 
> If you have the endpoints that support it, Codec2 might give you some
> benefits. This was originally designed for amateur-radio low bandwidth
> digital voice but is also supported by Asterisk.
> 
> It might also be that half-duplex communication (even if implemented
> with humans saying "over") could bring benefits as this would allow you
> to increase the buffer sizes without having people talking over each other.
> 
> Thanks,
> Iain.
> 
> 
> 

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