Thanks for the response, but evec with these steps, I still have the error "call failed:proxy authentication required" when I dial the IVR extension from an opensips' phone. Do any one know, what shall I do??? 

2012/4/16 Karsten Horsmann <khorsmann@gmail.com>
Hi.

You can use acl for that.

<http://lists.freeswitch.org/pipermail/freeswitch-users/2008-April/003067.html>

2012/4/16 azza miled <azza.miled@gmail.com>:
> Hi!
> I want that my FeeSWITCH receives calls from my opensips' users without
> requiring authentication. In other words, I want that my FS receives
> unauthenticated calls, only from the IP address of my OpenSIPS server. any
> help, please???



--
Mit freundlichen Grüßen
*Karsten Horsmann*

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