Hi Rafat,
what we do if we are doing in production environment, we cant say our customer to run gk on his machine.
If you are providing outgoing-only service, it should be fine; it's incoming calls that cause most of the problems with NAT.
For two-way, there is still no trouble for a small customer -- the ATA has uses different ports for each line.
The medium customer will use an FXS gateway with 4 to 8 ports, or a T1/E1 gateway. These are all ok with NAT, because they use only one call signal address.
The large customer should have his own GK :)
--Stewart
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