[asterisk-users] [hylafax-users] "No Carrier detected" sendig fax with Hylafax-Iaxmodem-Asterisk

[Lee Howard]

Johann Steinwendtner wrote:
> Lee Howard schrieb:
>   
>> fred wrote:
>>     
>>> That’s being said, before going through the T38 Gateway tests, I’ve 
>>> tried first the Fax2mail and Mail2fax solution with (Hylafax + 
>>> Iaxmodem + Asterisk), to make a well-tested Asterisk solution working 
>>> and I’m already facing some problems. Receiving faxes is ok but 
>>> sending faxes gets stuck into “No Carrier Detected”. Debugging leads 
>>> me to the following remarks:
>>>
>>> I) _Carrier or Called Station Identifier or (CED) tone_ from the 
>>> called fax machine is received since recorded (iaxmdm-iax.wav attached)
>>>
>>>       
>> The audio coming from the receiver is quite audibly corrupted (just 
>> listen to it and then compare to when you call a fax machine over TDM). 
>> No doubt you are attempting to pass fax audio through VoIP. Please read:
>>
>>     
> Is there a tool where I can feed the captured audio (e.g. extracted from
> tcpdump) in order to get a fax image ? Can hylafax in a certain mode do
> that ?
>   

I suspect that you're asking a different question from where the 
original poster was headed (hijacking the thread).  So, assuming that 
we're talking about clean audio and not corrupt audio as the OP 
provided...  There may be some utility with spandsp to do this.  As 
HylaFAX is not itself a DSP there is no such capability in HylaFAX.

Thanks,

Lee.