[SR-Users] kamailio + fax "other fax not responding"

[Mx R]

Hi there,

We use kamailio 4.3.3. And we have one problem with the fax. We send and
receive from and to our network, the fax does not work. Fax reports "other
fax not responding". When we send through our network to another operator
they receive fax.
What could be wrong?
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