[Freeswitch-users] send fax via google voice.

[curriegrad2004]

That's why PDF's/XPS/tiff's have replaced fax completely. Not many
people out there still do have a fax machine :)

On Sat, Mar 5, 2011 at 10:56 PM, Ken Rice <krice at freeswitch.org> wrote:
> Ok
>
> will sending a fax over it work... The answer is yes it will work..
> will it work reliably, no
>
> Faxing just needs to die already...
> The problem you have here with Faxing over G711 (PCMU or PCMA) is that
> faxing uses a modem to encode a digital signal into an analog carrier meant
> for a circuit switch voice network with a constant amount of delay and
> guaranteed delivery of the entire analog stream
>
> VoIP by definition is Voice Over Internet Protocol... IP is a packet
> switched network, where you can no guarantee a constant amount delay
> (latency) ... Not to mention it is not common to see a udp packet or 2
> missing along the way.
>
> Where as 1 20ms packet may not seem like much to you, that’s roughtly
> equivalent to 575bytes of data in the fax and it will screw up the fax
> either causing a corruption of the data, or a drop in the analog modem
> carrier which requires a retrain...
>
>
>
>
> On 3/5/11 11:35 PM, "envelopes envelopes" <sunwood360 at gmail.com> wrote:
>
> ok,
>
> Reliability is a different issue. I am just wondering whether mod_dingaling
> supports fax via GV. because someone proved sending fax via GV from fax
> machine did work
> .(http://www.magicjacksupport.com/faxing-via-google-voice-t7412.html).
>
>
>
> On Sat, Mar 5, 2011 at 9:18 PM, curriegrad2004 <curriegrad2004 at gmail.com>
> wrote:
>
> And relativity comes into play too.
>
> Also you do need to realize that the packets sent via UDP isn't
> guaranteed to be in order as the fax machine expects the data to be
> sent in order, not out of order. That's the beauty of packet switched
> networks.
>
> On Sat, Mar 5, 2011 at 7:29 PM, Steve Underwood <steveu at coppice.org> wrote:
>> On 03/06/2011 11:21 AM, envelopes envelopes wrote:
>>>
>>> Why is PCMU codec not reliable?
>>>
>>>
>> Unsynchronised clocks, and packet loss.
>>
>> Steve
>>
>>
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