Re: question on multiple call..HELP !

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江 先生,

I establish another tcp connection,but GK disconnect it(Why?).when another call arrives,GK establish a new connection.It seems that GK don't like to keep two(or more?)TCP connection.What should I do?

Your gateway should have no trouble accepting a separate TCP connection
for each call (after all, that is the only way it could handle calls
coming from different hosts).

The NAT box should have no trouble forwarding two or more TCP connections
from the same host (GK) to the same destination port (1720), because
the source ports used by the GK should be unique.  This is the same as
what happens if you have, say, a web server behind the NAT box, and a
browser opens several simultaneous connections.

You should test your gateway on the GK LAN, including simultaneous
incoming calls.  If that doesn't work, at least you will know that
the problem is not related to NAT.  If that does work, put it back
behind the NAT, and make sure that you have port forwarding set up
for your call signal port, H.245 ports if needed, and RTP ports.
Try to avoid H.245 troubles by using fast start and/or H.245 tunneling.
Try disabling any NAT-related features on the gateway.

If it still doesn't work, use the trace features and/or Ethereal
to determine what is going wrong with the second TCP connection.
It's possible that the NAT box is somewhat H.323-aware and is
mangling the signaling packets.  Try turning off any H.323 features,
or try putting the gateway in the DMZ of the NAT box.  You may need
to run Ethereal on both sides of the NAT, to see if any unwanted
packet modifications are happening.

Good luck,

Stewart



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