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Re: [hylafax-users] Unreliable fax services via VoIP connection



Uwe.

If you read Lee's post you will understand why VoIP will be unreliable for
fax.  Changing to an alternative Codec will have no bearing if you are using
a UDP/IP network (the 'internet').  We did a lot of testing of fax over VoIP
in both the UK and USA with very poor results.  I will try to get these
results published on our website.

Interestingly, we found that T.38 over a true IP connection is also
unreliable when compared to T.38 over PSTN.

Regards

ANDREW RINALDI
Mainpine Ltd. Support
USA +1 718 701 2422 | Asia/Europe +44 1225 436137 
andrew.rinaldi@xxxxxxxxxxxx | www.mainpine.com 

-----Original Message-----
From: hylafax-users-bounce@xxxxxxxxxxx
[mailto:hylafax-users-bounce@xxxxxxxxxxx] On Behalf Of Uwe Maier
Sent: 06 March 2006 13:30
Cc: hylafax-users@xxxxxxxxxxx
Subject: Re: [hylafax-users] Unreliable fax services via VoIP connection

Geoffrey wrote:

> Darrick Hartman wrote:
>
>> Lucas Barbuto wrote:
>>
>>> Hi all,
>>>
>>> My office is connected to the public phone network via a virtual PRI 
>>> through our VoIP provider. I have two external modems connected to 
>>> analogue ports on our PBX, both are used by Hylafax to receive 
>>> incoming faxes. The software works exceptionally well in converting 
>>> and dispatching messages, however, we have a lot of trouble 
>>> receiving faxes.
>>
>>
>> VoIP is not ready for use with faxing.  Do not use it.  Get an analog 
>> line for fax.
>
>
> I would guess it would depend on your personal experience.  I used my 
> voip for faxing all the time, never a problem.  Certainly it would 
> depend on the bandwidth you have available and how busy your network is.
>
Probably it depends on the codec you use: there are lossless and the others.

If there is a way to change to G711u or G711a (lossless 64kbit/s codecs) I
would give it another try.

Regards,
uwe

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