Hi,

I'm using UAC module in order to centralized authentication when I need to use an external proxy server to call PSTN numbers. To use it, I use a unique tuple login/pwd/domain

The environment is:
My openser handles the domain: "myopenserdomain.com"
For each INVITE or REGISTER of SIP client of this domain, I force the authentication
The external proxy handles the domain "externaldomain.com"

Now I have two questions:
1) before to send an INVITE to the external proxy, must I change the contact header with the correct information of the tuple login/pwd/domain ? Or I must wait the 401 or 407 message before ? In fact I tests several external proxy. Some are waiting a contact header with the information of the tuple and some don't. What is the correct way to do this ?

2) Some of this external proxy accept only my INVITE (with or without contact header modified) if I registered first on it ! I receive 403 message in this situation. But I don't know how to REGISTER first since I don't find any openser module to that … How can I handle this situation ?

Thanks,
Regards,
Christophe