asterisk users - Jan 2008 - service provider connection problem

Hello all,

Can anyone have any experience working with service provider
like Talkfree .

They are giving the  user accounts based on the  single  user accounts
and those needs to be directly register to the service provider not to the
local system

i have taken a connection which when configured to service providers domain
direclty ,xlite can make calls without any problem but if i want to use it
using
my asterisk server (for a simulation to call center) the service provider is

asking for 407 proxy authentication and i am unable to resolve this issue

can anyone have any circumventing ideas to this solution????????


thanks and regards
srinivas antarvedi
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