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

["andrew rinaldi" <andrew.rinaldi@xxxxxxxxxxxx>]

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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