HD VoIP solutions for a new home
SeanTek:
Well, about Callcentric...
I am currently on their IP Freedom plan with a NY free phone number. Unfortunately the test went very poorly, both with VentaFax (and more recently, with Bria for iPhone). VentaFax is Windows software that sends and receives faxes, including color faxes--it's like one of the few fax apps on the market that actually does that, plus it includes direct SIP connectivity with T.38 and G.711 options. Strangely enough, when VentaFax picks up the SIP phone via Callcentric, the fax tone is the wrong tone. Instead of the reception tones (which sound like a high-pitched tone for a long second followed by shrill fluttering chirps), the Callcentric end emits the transmission tones (which sound like a short medium-pitched BEEP, repeating every second or two). My sending fax device therefore sits there emitting the BEEP, but it hears the same BEEP on the other end, so the endpoints basically continue BEEPing at each other and no fax transmission actually begins. :o For the record, I tried both T.38 and G.711 options.
I tried t38fax.com (a FoIP-specialized provider), and t38fax.com gets it exactly right. This should not be rocket science...anyway, that is my Callcentric experience. It's possible that the VentaFax FoIP software is messing it up, but I highly doubt it.
(In fairness, Callcentric's Fax Reception feature worked fine for receiving black & white faxes, if I want to dedicate a number solely to fax. Fax Reception for color faxes was a bust: it errored out without sending any pages.)
SeanTek:
An update: I got as far as selecting Anveo as my provider: its feature list seemed to hit all the right points (SMS, fax, optional G.722). Unfortunately I have not been able to figure out how to set up additional SIP accounts to link additional (non-OBi) devices and softphones: in fact it appears to be hardwired to just one OBi phone. Unless there is some way around this, it looks like Anveo is out.
I guess one option is to switch to the open-ended "Starter" package that is not OBiTALK-specific, which shows that it allows up to 3 users/SIP accounts. But with the line fees and per-minute fees, the price is a bit steep.
drgeoff:
Quote from: SeanTek on December 30, 2015, 09:32:21 am
Prior to the introduction of these PCM and FDM techniques, there literally was one (effective) electromechanical circuit per phone call from one end to the other. I guess that would be up through the mid-1960s or so. Was audio quality markedly better, worse, more wide-band, or just different, back in those days? For those who remember, anyway. :)
There was low pass filtering in play long before FDM and PCM. Longer circuits over pair cable had loading coils. https://en.wikipedia.org/wiki/Loading_coil
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