[Kamailio-Devel] How does Kamailio match an ACK for a stateless [3456]XX replied by Kamailio itself?

[Alex Balashov]

Iñaki Baz Castillo wrote:

> Thanks a lot for pointintg it out, but I don't understant why "To_tag" is 
> preferred over "branch".

It is not my impression that the to-tag is compared as such.  Instead, 
it appears that a CRC digest of the Via headers is built into the to-tag.

If you look in modules/sl/sl_funcs.c:sl_send_reply_helper() you will see 
that calc_crc_suffix() is called there too in the generation of the 
reply's to-tag.

So, it appears to me that the to-tag - or some part of it - is in effect 
a derivative of the Via values.

-- 
Alex Balashov
Evariste Systems
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