Bandwidth

[jlodvo]

First of all wow great job you guys doing here, been looking everywhere for something like this.

i was wondering if it is possible to use multiple dsl connection for this istead of T1 lines?

like this 8 wan router
http://www.edimax.com/html/english/products/ER-1088.htm

has anyone tried this b4? need info on this thanks what is the pro's and con's of T1 vs. multiple DSL?

[mflorell]

I have never tried anything like that, but you will need a provider that doesn't do IP address validation. You may have issues with some SIP/IAX providers because of multiple port connections being established over different network connections but I'm not sure.

If you end up doing it please post your results. Many people here would be very interested.

[jlodvo]

will sure do if we get it working, whats a safe latency between our side and a sip provider proxy? gonna do latency test first so i'll know what voip provider im gonna try for this test, im in asia so latency will be a big problem for me if not using T1 lines, but we trying to find cheaper alternatives in terms or internet connection =)

[mflorell]

300ms is a tolerable latency. The issue usually with DSL is the fluctuations in latency and bandwidth. 99% of the time it'll be great less than 100ms latency and then your neighbor decides to download a large file and your latency goes through the roof.

[jlodvo]

if i ping a site would it be a good test for latency, lets say i use a torrent client and download lots of stuff and ping a sip proxy to observe would this be a good test?

[mflorell]

That would be a pretty good test, but you can never predict what will happen on a shared network like DSL. We had DSL for 2 years and it was great for the first year and a half with only a couple outages that lasted a few hours at most. Then the last 6 months we had it it was horrible. Kept going down and Verizon started routing all traffic 8 states away before it went anywhere, where previously it just went to a local peering location and hooked in with other networks there.

[jlodvo]

Yikes, that was bad, I think I should do more test, anyway I can get 10-12 2mb/786kb DSL account for the price of a T1 here in our area so, I think it’s a good deal, and maybe divide it to like 4 diff provider so if one provider goes down then I’ll have a fail over.
How much simultaneous sip voip connection could a T1 handle? I was planning to start a 10 seat test first and slowly add more, and if it gets slow maybe convert to T1's

[mflorell]

we have realiably done 50 IAX calls with GSM codec over a standard T1(1500kbps) The latency was good and it was a single T1.