SIP support in NAT

["K K Palei" <kpalei () dlink-india com>]

Hi
 All, Here is a doubt regarding SIP support in NAT.
As per NAT, an external host (having a global ip address) can not access the
local host behind NAT. If the local host has started a session, then packets
from external host for this particular session should be allowed. If this is
the case then calling from external host to local users behind NAT will
never possible.   In case of SIP/MGCP/H.323 only local users can make call
and never will be able to receive calls. How should this problem can be
overcome, please suggest.

regds,
Kamalakanta

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