[Users] transcation lifetime

[Klaus Darilion]

Hi!

Some questions regarding tm:

How long does statefull transactions live inside openser? Is it correct 
that wt_timer is the timeout for completed transactions, and 
fr_inv_timer/fr_timer is for incomplete transactions?

What is a complete transaction in case of INVITE? With or without ACK?

openserctl shows 44 transactions although the box is idle since long time:
tm:inuse_transactions = 044

Are there really 44 transaction open or what does 044 mean?

How much memory does a transaction approximately need (no AVPs)?

thanks
klaus