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<TITLE>Re: [Freeswitch-users] send fax via google voice.</TITLE>
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<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Ok<BR>
</SPAN></FONT><OL><LI><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>will sending a fax over it work... The answer is yes it will work..
</SPAN></FONT><LI><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>will it work reliably, no<BR>
</SPAN></FONT></OL><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Faxing just needs to die already... <BR>
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<BR>
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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.<BR>
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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...<BR>
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On 3/5/11 11:35 PM, "envelopes envelopes" <<a href="sunwood360@gmail.com">sunwood360@gmail.com</a>> wrote:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>ok, <BR>
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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<BR>
.(<a href="http://www.magicjacksupport.com/faxing-via-google-voice-t7412.html">http://www.magicjacksupport.com/faxing-via-google-voice-t7412.html</a>). <BR>
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On Sat, Mar 5, 2011 at 9:18 PM, curriegrad2004 <<a href="curriegrad2004@gmail.com">curriegrad2004@gmail.com</a>> wrote:<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>And relativity comes into play too.<BR>
<BR>
Also you do need to realize that the packets sent via UDP isn't<BR>
guaranteed to be in order as the fax machine expects the data to be<BR>
sent in order, not out of order. That's the beauty of packet switched<BR>
networks.<BR>
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On Sat, Mar 5, 2011 at 7:29 PM, Steve Underwood <<a href="steveu@coppice.org">steveu@coppice.org</a>> wrote:<BR>
> On 03/06/2011 11:21 AM, envelopes envelopes wrote:<BR>
>><BR>
>> Why is PCMU codec not reliable?<BR>
>><BR>
>><BR>
> Unsynchronised clocks, and packet loss.<BR>
><BR>
> Steve<BR>
><BR>
><BR>
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