I ran the test with Netmeeting 3.01 at noon, and it ran well.
You are not explaining your problem clearly. Do you mean that with Netmeeting running on the epB machine, you can register with the GK, call epA and get audio in both directions? Can you also call from epA to Netmeeting, with no problems? What kind of NAT hardware or software is between epB and the cable modem? What ports are you forwarding? When your call from epB to epA fails, is there no audio in either direction? What phone software are you using? Also, please post your GK configuration.
Any idea how could i check why there is no audio transmission over a cable network while using openh323.?
I would run Ethereal to see what addresses and ports are being negotiated for the RTP, and where the RTP packets are actually being sent. You may need to capture the traffic on both the GK machine and on epB, to see how the NAT is altering port numbers and/or blocking packets.
If your cable company offers their own VoIP service, it's possible that they would block some ports to prevent you from using another service. If you suspect this, you may need to also look at the traffic on the WAN side of your NAT box. (I think that this is unlikely, because blocking port 1720 would also affect Netmeeting.)
--Stewart
I've been running some test of H.323 over cable networks with the following configuration
epA(1)-----------------(2) || GK ||(3) ----------(4)|| ISP over Cable network ||(5)--------(6)epB, epC (epB, and epC use same ip address but different siganling, ras, and rtp ports)
|_____(7)epD,epE (dial-up connection 56kbps)
(epD, and epE use same ip address but different siganling, ras, and rtp ports)
(ep, means endpoint)
|| X|| , doble parallel bars means firewall, X represents what is in the middle
*epA is on private ip at (1),
*GK is on a firewall on a server running linux redhat, working fine as a proxy (I know this becuase i've tested voice transmission from dial-up connection outside of the firewall as shown in epD at (7) and I can communicate very clearly with epA, bidirectionally with no problem).
*ISP over Cable network , at (4) has a fixed public IP address attached to epB by MAC matching,
at (5) has private IP adress.
*epB at 6 has private IP address
The situation is a s follows: from epB, i can registert to the GK, establish a call up (setup, connect, opening of audio channels), but udp packets that carry voice cannot pass to epA,or epC, even more
I cannot hear myself when i call epC from epB, eventhough as i said before, connectino is established (arq, acf, setup,..., until opening of audio channels work fine).
Some interesting points might be:
*I have disabled bandwidht management at GK, the requested bandwidht by any ep is 100000 (as default value for initialbandwidth in H323Endpoint). I don't think it is a bandwith problem
because I'm receving ACF from GK. And more, I dont get a connection cleared message with rease NoBandwidthAvailable, even more, audio channels don't get broken because i can stay on the call hearing nothing for as long as i want.
*The same operation was done on dialup connection (epD,epE) and works fine.
Question:
*what should i do to hear myself at least locally (my PC, between epB, and epC) behind cable network LAN?
*what effect might cause a cablemodem on the PC strong enough to not allow hearing myself on the same PC?
*in general, any idea? links that i could rview
*I'm about to run Netmeeting over the cable network to the ouside world to see if ti works, has somebody tried this at home?
Best regards.
Ulises Vega
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