Yes, I meant it acts as a media server as in a big picture description, and that all SIP signaling between FreeSWITCH and the UE and remote networks is proxied through Kamailio, which is the only entity able to reach FreeSWITCH's SIP ports.

Thanks for clarifying that the challenge can't be repeated from one leg to the other. Is there any way I could obtain the credentials at runtime, on a per-call basis, or is that something I can only do in FreeSWITCH's configuration?

Thanks.

On Mon, Mar 28, 2016 at 9:17 AM Alex Balashov <abalashov@evaristesys.com> wrote:

‎The problem with your description of your scenario is that it is not technically accurate. Conceptually, you may think that Freeswitch merely "acts as a media server" and "all SIP signalling is proxied through Kamailio", but in reality, all SIP signalling passes through FS, too, which generates a new call leg in the process, as it's a B2BUA.

Viewed in that light, the question ‎isn't so much whether you can "relay" a 407 challenge (you cannot) as whether you can obtain valid credentials from the caller and feed them as a response on your outgoing leg.‎
‎
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