ASA/PIX inside SIP Phone to outside SIP provider

Hi Group
We try to connect internal sip phones to a provider on an outside
provider. I play arround with the inspect sip.
When inspect sip is set, a can do an outgoing call, but when i call
this phone, it rings, i pick it up, but i can't hear the other end.
With no inspect sip, it's vice versa.
Just for trying, i give an "access-list like access-list
outside_access_in extended permit ip any any", but nothing change.
I found some hints with a STUN Server, but my provider does't have
STUN Servers.
Any idea, where i must looking for the right way?
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