What exactly is the appropriate syntax for the value of the ac_extra_hdrs option in K3's 'tm'?

As described here, it is not very clear:

http://www.kamailio.org/docs/modules/3.0.x/modules/tm.html#ac_extra_hdrs

   modparam("tm", "ac_extra_hdrs", "myfavoriteheaders-")

What does this mean? Where do I put the header name, and what is the delimeter? Is it a semicolon or colon-separated list? What if, for example, I want to pass X-Alex-Status and X-Alex-Cause in CANCELs and negative ACKs from the original INVITE? Do I use ...

   modparam("tm", "ac_extra_hdrs", "X-Alex_Status;X-Alex-Cause")

If so, what is the significance of the '-' in the above example?

Thanks!

--
Alex Balashov - Principal
Evariste Systems LLC

Tel    : +1 678-954-0670
Direct : +1 678-954-0671
Web    : http://www.evaristesys.com/

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