There is this endless push and pull on this topic, those who want them assume it should be default, those who don't assume that should be default. This probably needs a configuration option defaulting to pass them (those who don't want to pass them are usually a bit more educated and would find the option better than the other way around). Mike On Oct 9, 2009, at 3:10 PM, Kristian Kielhofner wrote:

Hello everyone,

In using FS for various scenarios I've noticed some behavior that I'm not sure is completely "proper". Given that this probably lives in mod_sofia who knows what's really "proper". It is SIP after all...

So the issue comes up when using FreeSWITCH as a B2BUA and bridging between endpoints (very common). Should FreeSWITCH copy the X- headers (possibly others) as it does now? I'd like to think it shouldn't by default and the behavior should be one of:

1) Don't pass X-* (or anything else, really) from one leg to another. If you want to pass specific X- headers (or anything else), set them explicitly on the outbound leg. 2) Make the behavior configurable with a channel variable and/or sofia config option:

{sip_pass_headers=all|none|X-MyCustomHeaderByName}

Thoughts?