Re: Hylafax without modems - SIP?

On 01/26/2016 02:12 AM, Gary Stainburn wrote:
> I've just had to replace my Hylafax server as the cooling fan in the rack case
> has died and could not be replaced.
>
> My box runs three fax modems, one for each of the original 3 fax machines that
> got skipped years ago.
>
> This means that I now have 3 lots of:
>
> USB to seral converter (new box doesn't have any COM ports.
> 9pin->25-pin serial cable
> Modem
> power supply
> phone line
> analogue port on our Mitel 3300 controller
>
> I was wondering if there a better way?

I have never used USB modems much with HylaFAX.  Certainly I have never 
used USB-to-serial adapters.  So... I may not have the perspective that 
you need.

Also, I do work for Mainpine, and so my opinions are undoubtedly biased 
because I have in-depth experience with Mainpine's product.

Why not use a 4-port internal PCIe/PCI multi-port fax board like the IQ 
Express?  That will eliminate all of those cables and power adapters.

> I've done lots of Googling and there is a lot of conflicting - and mostly very
> old - information out there.

Yet, it's probably all quite accurate, still.

> Does anyone have any more up-to-date opinions or advice on doing this?

Your message body doesn't say VoIP/SIP, but the subject line does. So, I 
am guessing that this question (and possibly those above it) were with 
VoIP/SIP in mind.

> Most of the concerns about reliability were based on IP latency, but my fax
> server and my Mitel controller are both on the same Procurv Gigabit switch so
> hopefully that would be quick enough

SIP is generally operated on UDP.  UDP allows the routers/switches to 
drop packets at-will.  That can happen without respect to latency.

While latency may be an issue if it's bad-enough most VoIP trouble that 
I've seen has to do with dropped/missing packets.

Your comments don't describe your infrastructure well, and so it's 
difficult to determine if you're using a VoIP service provider for 
access to the PSTN or if your equipment interfaces with the PSTN 
directly.  If it's the latter then you have the ability to control much 
more of the call path and possibly mitigate some of that packet loss.

See:  http://hylafax.sourceforge.net/docs/fax-over-voip.pdf

Thanks,

Lee.



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