asterisk users - Nov 2007 - How to disable Asterisk 407 Proxy Authentication Required Challenge response

Hi,

I have an UAC registered in VoIP provider. (register command in sip.conf)
When I try to make call from PSTN through this VoIP provider, when INVITE
reaches
asterisk is sents 407 Proxy Authentication Required Challenge response.
How can I disable this, because I want to allow any external call from my
sip provider.

Thanks in advance
Tomasz
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