[Freeswitch-users] send fax via google voice.

Ken Rice krice at freeswitch.org
Sun Mar 6 20:44:53 MSK 2011 

That makes it even easier in those countries... The whole point is anywhere
along the line and then some on the PSTN there are multiple points in which
a call can be compromised just as easy if not easier then cracking a network
along the way. Any 10 year old with 5 minutes of instruction can build a
pstn line tap and listen to phone calls... Its only a step up from that to
tap fax line... That being said, just because its perceived by luddites to
be more secure then say an email doesn¹t make it so...




On 3/6/11 11:33 AM, "Madovsky" <infos at madovsky.org> wrote:

> because crypto was and is not allowed in some countries also...
>>  
>> ----- Original Message -----
>>  
>> From:  Ken Rice <mailto:krice at freeswitch.org>
>>  
>> To: FreeSWITCH Users Help <mailto:freeswitch-users at lists.freeswitch.org>
>>  
>> Sent: Sunday, March 06, 2011 12:23  PM
>>  
>> Subject: Re: [Freeswitch-users] send fax  via google voice.
>>  
>> 
>> Geography doesn¹t stop a determined attacker...
>> 
>> Just because its a little more difficult, that doesn¹t mean it is  secure...
>> If that were the case then Classified US Government Faxes wouldn¹t  require
>> crypto gear in line (see STU-III for an example of this that¹s over 20  years
>> old)
>> 
>> K
>> 
>> 
>> On 3/6/11 11:08 AM, "Madovsky" <infos at madovsky.org>  wrote:
>> 
>>  
>>> I think it's more hard for a guy to hack your US  pstn line if he lives
>>> in Australia... fax on internet can be hacked from  everywhere...
>>>  
>>>> 
>>>> ----- Original Message -----
>>>>  
>>>> From:  Ken Rice <mailto:krice at freeswitch.org>
>>>>  
>>>> To: FreeSWITCH Users Help <mailto:freeswitch-users at lists.freeswitch.org>
>>>>  
>>>> Sent: Sunday, March 06, 2011 11:55   AM
>>>>  
>>>> Subject: Re: [Freeswitch-users] send fax   via google voice.
>>>>  
>>>> 
>>>> What security reasons? Its just  as easy to tap a PSTN  line as it is to
>>>> sniff a network connection,  the only difference is you might  need a
>>>> little bit different  hardware...
>>>> 
>>>> If it were about security, fax  machines would  actually encrypt a fax but
>>>> they don¹t... 
>>>> 
>>>> 
>>>> On 3/6/11  1:55  AM, "envelopes envelopes" <sunwood360 at gmail.com>   wrote:
>>>> 
>>>>  
>>>>  
>>>>> that is not true.
>>>>> 
>>>>> Real estator/law   firm/accounting offices/travel agents...many of them
>>>>> still prefer  fax for  security reasons.
>>>>> I am always worried about sending my  driver license pdf  file via e-mail.
>>>>> 
>>>>> 
>>>>> 
>>>>> On Sat, Mar 5,  2011 at 11:34 PM,  curriegrad2004
>>>>> <curriegrad2004 at gmail.com>   wrote:
>>>>>  
>>>>>  
>>>>>> 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, that¹s
>>>>>>> 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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