[Serusers] Forward calls to external proxy that need authentication

[Stéphane Muller]

Hi everybody, 

I would like to know if it is possible to forward a call to an external proxy/pstn-gateway
that need authentication ?

I have read in the archives that SER itself can't do that, but it is possible by interacting
with sipsak... Is it correct ? And if yes, exactly how ?

Thank's a bunch for any answer.

Steph