I think I've figured it out. When routing the initial INVITE, I had it hairpinned through the SBC under the 'transparent' profile because it comes from a trusted source. The BYE that's being challenged is coming from the callee, which is not trusted by the caller/dialog initiator.

I think that routing the initial INVITE transparently means the dialog is associated with that profile, and that sequential requests will take the same path. I can't selectively apply 'auth_b2b' only to an in-dialog request when the dialog was created within 'transparent' processing, right?

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Alex Balashov - Principal
Evariste Systems LLC
260 Peachtree Street NW
Suite 2200
Atlanta, GA 30303
Tel: +1-678-954-0670
Fax: +1-404-961-1892
Web: http://www.evaristesys.com/
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