Re: Can't send Fax but can Receive

On 10/05/2017 05:25 AM, FM wrote:
> 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.

That is not strange at all.  VoIP jitter is a variable depending on so 
many things.  So, that it was better before and is worse now is not 
unusual for VoIP.  Chances are that in a week or two or a day or two it 
will be even worse or better.

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

So, that tells you that the call audio quality on that call path is 
better than the others.  Still, it doesn't really help you resolve the 
problem with the other calls.

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

No. There is no way for you to solve the problem directly.  As I already 
said before, you will have to work with your service provider to remedy 
the problem.  (And, even then, they may have only a limited control on 
the factors involved.)

Thanks,

Lee.


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