[Kamailio-Users] Option ac_extra_hdrs to tm in K 3.0.x

[Alex Balashov]

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

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