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yes. I cannot take a telephone to another network and have it work. Actually, I seem to have data ie: display information from my system, but no audio. The manufacturer assures me that the ports are not opened- how can I prove otherwise?
I have tried 2 different routers on my network and the same ports failed to open on both routers, where 5038 opens but 5037 says closed. 5222 opens yet 5223 says closed, 2020 says opened but 2222 says closed. I put the system's IP in the dmz and now telephones will work on other networks, but I will not know for certain untill I get the manufacturer to connect. Thank you in advance... Regards