Re: [hylafax-users] Faxing over VOIP?

["Jamin W. Collins" <jcollins@xxxxxxxxxxxxxxxx>]

Rob Rothberg wrote:
> Again, it might be working well for you, but if you do a large volume of 
> faxes and it's critical to your business, you can't count on 100% 
> reliability.  Tha paragraph below is right out of IAXmodems documentation:
>
>
>     Required network quality
>
> The audio path between the DSP and the PSTN really cannot be over any 
> sort of a medium that will experience a frequent variance in the 
> latency. So IAX is okay as long as the network will not "jitter". This 
> is possible, and is especially possible when talking about a short, 
> short IAX connection over the loopback device. If you involve any 
> traditional "VoIP" medium (like an average LAN, WAN, or the internet), 
> then the likelihood of the medium's variance in the latency will cause 
> data corruption to occur... and depending on the frequency and timings 
> of that data corruption will influence the likelihood of that data 
> corruption causing a fax failure.

Based on this paragraph it is indeed possible and can be counted on. 
You simply need to prevent the "jitter".  I too have been using multiple 
iaxmodems with Hylafax.  The key is simply not to past the iax 
conversation over any medium or connection that you can not control the 
latency or jitter on.  This means using either localhost connections, 
private network cabling between the two, or a very well configured 
public network.

--
Jamin W. Collins

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