I am trying to set up opensips on the server, which should detect
clients that are behind NAT.
The main way to determine NAT in opensips book is to check Contact
header of a request: if it contains 192.168.* address, then client is
behind NAT. But sniffering requests of SIP communicator, I found that
Contact header does not contain inner (192.168.*) IP addres, but
contains outer address from the router.
Does it really try to resolve NAT itself?
Is it possible to turn off this?
How to determine NAT in case if 192.168 address does not present?
Is it required to determine NAT?