[Asterisk-Users] authentication fails to provider after upgrading to 1.2.0

[Urban]

Hi,

after we upgraded to 1.2.0 we can not make any outgoing calls to our sip 
provider (incoming works). I think the provider is running asterisk 
1.0.9. I have a tcpdump that indicates that our asterisk is not 
responding correctly when the providers asterisk is saying 'Proxy 
authentication required' Here is the sequence:

INVITE sent to provider
407 returned from provider (proxy authentication required)
ACK sent to provider

normally a new INVITE should be sent after the ACK with digest info to 
the provider, but it's not. Instead our asterisk is returning 503: 
Service unavailable to the internal extension placing the outgoing call.

any ideas?

thanks
urban