[Serusers] fr_inv_timer in tm module

[Koyama Zehi]

Dear all,
When i was reading about tm module ( http://www.iptel.org/ser/doc/modules/txt/tm.txt )
I found this section ...
******************************************************************************************************
1.3.2. fr_inv_timer (integer)

   Timer which hits if no final reply for an INVITE arrives after
   a provisional message was received (in seconds).

   Default value is 120 seconds. 

   Example 1-2. Set fr_inv_timer parameter
...
modparam("tm", "fr_inv_timer", 200)
*****************************************************************************************************
 
But I could not understand here what is the meaning of "provisional message" and how fr_inv_timer behave..
Please some one teach me about this with some example...
thanks in advance..

		
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