Re: Can't send Fax but can Receive

Thank you for the reply.

My ISP is at the same time My VOIP provider. I use a sip trunk for voice + fax. I use ullaw and allaw as codecs.

The strange thing is, some months ago I was able to send fax with no problem.

By the way, if I send fax to a number that also is a virtual fax with hylafax + iax2 extension it Never fails.

With this info, is there anything I could test to solve the problem?

Thank you!

No dia 05/10/2017, às 05:25, Lee Howard <[email protected]> escreveu:

>> On 10/04/2017 01:31 PM, FM wrote:
>> I'm using ISSABEL wich is an Elastix Fork. I'm using this with my provider SIP TRUNK and configured as a virtual fax (with IAX Extension). I can receive faxes but it seems I can't send.
>> 
>> Example of Hylafax Logs:
> 
>> Oct 04 19:55:08.89: [10375]: DIS/DTC received 3 times; DCS not recognized
> 
>> Oct 04 19:59:34.50: [10721]: TRAINING failed
> 
> The receiver's repeated FTT (failure to train) or DIS signals mean that the signals that you're sending (DCS, FCS) are not getting through clearly to the receiver.  The call audio quality is bad, likely due to jitter.
> 
> You'll have to work with your service provider to remedy that problem.  Unfortunately, unless the network between you and your service provider is controlled by you or them (e.g. not the internet) then there's really only so much that you can do about that.
> 
> That receiving works but not sending is merely an indication of where the jitter is occurring in the audio stream.  (It's happening on your uploading more than your downloading.)  It's extremely important for the sender to be heard clearly by the receiver because the sender will be sending signals to the receiver at much faster bitrates.  The receiver's signals back to the sender are only ever V.21 300 bps HDLC, so those are likely to get through with a bit of patience.
> 
> Unfortunately, if there is only an internet path between you and the provider then you're really not going to be able to mitigate jitter problems very well or consistently for long.  Ideally you'd get a PSTN (POTS, DAHDI) interface with a provider who also uses PSTN rather than VoIP ... or you would simply outsource the faxing entirely via an on-line fax service provider.
> 
> Thanks,
> 
> Lee.
> 


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