| http://www.w3.org/ns/prov#value | - If one is really concern about security, they can actually close all ports except port 5061 and IM will still work. (That is assuming they have other NIC/access to the server for administration and necessary infrastructure access.)We can limit the client range of dynamic ports for A/V file communication.If there is any firewall between/in front of the client, it can effective block all dynamic por
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