[Kamailio-Users] STUN and TM

Jason Penton jason.penton at smilecoms.com
Fri Jan 30 08:00:49 CET 2009


Hi *,

What is the logic behind the transation matching in Kamailio. I am finding a
problem whereby a call setup transaction (INVITE, 180 Ringing, PRACK, 200OK,
ACK). between 2 Snom phones works in normal mode. However, when one phone is
behind a NAT with STUN support, everything works perfectly (i.e. call setup,
2-way audio, etc), BUT the tm module doesnt match the transaction between
the original invite and the subsequent messages (180, 200ok, etc). the
impact here is that the fr_inv_timer eventually fires even though the call
has been answered. Note: this only happens when the call is destined for the
device behind the NAT.

Any ideas.

Perhaps an explanation on how the tm module does transaction manager.

RFC3261 states that transaction matching is done based on the via branch
parameter.

Thanks in advance
Jason
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