Fax over IP Providers
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Posted by Laura on September 27, 2006, 5:50 am
Please log in for more thread options hello, i would like to know if there are Fax over ip providers, and where I could get more information about it. Thank you Laura | |||||||||||||||||||||||||
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Posted by Enzo Michelangeli on September 27, 2006, 10:08 am
Please log in for more thread options > hello, i would like to know if there are Fax over ip providers, and where
> I > could get more information about it.
Retail or wholesale? Generally speaking, fax over IP is unreliable unless the T.38 protocol is supported (by _both_ sides). The list at http://www.voip-info.org/wiki/view/VOIP+Service+Providers+T.38 represents an attempt to track T.38 support by PSTN termination providers, and is the best source I can point you to. On your side, you'll need an suitable ATA: the Linksys SPA-2102 (two ports) and the GrandStream HT386 (one port) are said to support T.38, but I've never tested this feature. Anyway, here's a supplier for both such devices that I have found reliable and inexpensive (also for non-US shipments): http://www.telephonyware.com/telephonyware/tw00329.html http://www.telephonyware.com/telephonyware/tw00219.html Enzo | |||||||||||||||||||||||||
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Posted by Laura on September 28, 2006, 5:10 am
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I would be more interested on wholesale providers... Ive checked the links and Ive checked the ATA systems.. I understand that they digitise the fax signal. But I was thinking on something more like skype.. But maybe Im dreaming too much... If I have an Broadband line in my house, and 3 computers connected to internet.They could be making 3 skype phone calls, but could they be sending 3 fax at the same time? WOuld this Fax over IP system be faster?, or send various at the same time? Thanks for your time >> hello, i would like to know if there are Fax over ip providers, and where
>> I > could get more information about it.
>
> Retail or wholesale? > > Generally speaking, fax over IP is unreliable unless the T.38 protocol is > supported (by _both_ sides). The list at > http://www.voip-info.org/wiki/view/VOIP+Service+Providers+T.38 represents > an attempt to track T.38 support by PSTN termination providers, and is the > best source I can point you to. On your side, you'll need an suitable ATA: > the Linksys SPA-2102 (two ports) and the GrandStream HT386 (one port) are > said to support T.38, but I've never tested this feature. Anyway, here's a > supplier for both such devices that I have found reliable and inexpensive > (also for non-US shipments): > > http://www.telephonyware.com/telephonyware/tw00329.html > http://www.telephonyware.com/telephonyware/tw00219.html > > Enzo > | |||||||||||||||||||||||||
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Posted by Enzo Michelangeli on September 28, 2006, 6:00 am
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>I would be more interested on wholesale providers...
> Ive checked the links and Ive checked the ATA systems.. I understand that > they digitise the fax signal. Yes, and that's quite silly if you think about it, because the modem inside the fax machine works hard to convert the digitally encoded data to analog form... An ATA can provide one or more ports equivalent to telephone lines ("FXS ports") to which you may connect telephone sets; and/or one or more ports equivalent to telephone sets ("FXO ports") that can be connected to a telephone line. > But I was thinking on something more like skype.. But maybe Im dreaming
> too much... If you just want to send picture from a PC to another PC, all you need is a scanner producing an image file that you will then send in one of many possible ways: for example, e-mail or Skype-based file transfer. The problems begin when you want to send your pictures to actual fax machines connected to the PSTN (Public Switched Telephone Network). > If I have an Broadband line in my house, and 3 computers connected to
> internet.They could be making 3 skype phone calls, but could they be > sending 3 fax at the same time? Well, IP is a packetized protocol, so you can share the bandwidth among multiple independent sessions. > WOuld this Fax over IP system be faster?, or send various at the same
> time? Yes, but more often than not you can't just attach your fax machine(s) to FXS ports of an ATA registered to the server of some PSTN termination provider, even using uncompressing codecs such as G.711, because the fax protocol is very sensitive to latency (propagation delay) and especially jitter (random fluctuations of the latency), which on the other hand are well tolerated by the human ear. The result is that connections that "sound good" to a human may sometimes work for fax transmission, and sometimes not... That's why several other mechanisms have been devised to send fax messages over IP, ranging from store-and-forward systems such as email-to-fax gateways (check out the free service by www.tpc.int ) to the T.38 protocol for realtime fax transmission. My impression is that not much effort is currently spent on fax-over-IP because, in the age of Internet, fax technology is increasingly perceived as a barbarous relic of the past... Cheers -- Enzo | |||||||||||||||||||||||||
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Posted by Laura on September 28, 2006, 6:38 am
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Thanks for all your answers, I agree that fax will disappear soon...so I understand that they dont put effort on it. So regarding all these companies send2fax or jblast ... etc... how can they send all these big amount of fax so quick? I was convinced that they would do it over ip.. Laura >>I would be more interested on wholesale providers...
>> Ive checked the links and Ive checked the ATA systems.. I understand that >> they digitise the fax signal. >
> Yes, and that's quite silly if you think about it, because the modem > inside the fax machine works hard to convert the digitally encoded data to > analog form... > > An ATA can provide one or more ports equivalent to telephone lines ("FXS > ports") to which you may connect telephone sets; and/or one or more ports > equivalent to telephone sets ("FXO ports") that can be connected to a > telephone line. > >> But I was thinking on something more like skype.. But maybe Im dreaming
>> too much... >
> If you just want to send picture from a PC to another PC, all you need is > a scanner producing an image file that you will then send in one of many > possible ways: for example, e-mail or Skype-based file transfer. The > problems begin when you want to send your pictures to actual fax machines > connected to the PSTN (Public Switched Telephone Network). > >> If I have an Broadband line in my house, and 3 computers connected to
>> internet.They could be making 3 skype phone calls, but could they be >> sending 3 fax at the same time? >
> Well, IP is a packetized protocol, so you can share the bandwidth among > multiple independent sessions. > >> WOuld this Fax over IP system be faster?, or send various at the same
>> time? >
> Yes, but more often than not you can't just attach your fax machine(s) to > FXS ports of an ATA registered to the server of some PSTN termination > provider, even using uncompressing codecs such as G.711, because the fax > protocol is very sensitive to latency (propagation delay) and especially > jitter (random fluctuations of the latency), which on the other hand are > well tolerated by the human ear. The result is that connections that > "sound good" to a human may sometimes work for fax transmission, and > sometimes not... That's why several other mechanisms have been devised to > send fax messages over IP, ranging from store-and-forward systems such as > email-to-fax gateways (check out the free service by www.tpc.int ) to the > T.38 protocol for realtime fax transmission. > > My impression is that not much effort is currently spent on fax-over-IP > because, in the age of Internet, fax technology is increasingly perceived > as a barbarous relic of the past... > > Cheers -- > > Enzo > | |||||||||||||||||||||||||
