Skype for Linux Listens on TCP and UDP 5744

Hello all, I'm guessing that there's a simple answer to my inquiry that I overlooked in my web searches. I'm running the current version of Skype for Linux (which, as of this writing, is 4.3.0.37). While looking at my computer's running processes, I noticed Skype listens on ports TCP/5744 and UDP/5744 while logged in, allowing it to be a server for some sort of inbound connection. I cannot find any documentation or IANA port registration for Skype, so I posted in the community forum. Does any one know why Skype listens on those ports; and would I have an improved user experience if I permitted my firewall to allow inbound connections on those ports? Thanks!

I've observed this: When I first logged in, I received an inbound connection on the TCP port from a Skype server (determined by Reverse DNS) that was repeated on regular intervals. On the UDP port, I saw what appears to be 'heartbeats' sent out from my Skype client to IPs residing on rather 'prestigious' networks around the World (no more than 50), with those hosts responding in turn. Now, both TCP and UDP connections have continuous activity, so much so, I recorded at least 4GBs of data being transferred in the course of eight ( hours. That equates to 2GB in both directions, bring the total to (at minimum) approximately 568 kb/s connection (factoring in other observations, giving approximations and not providing specifics). I want to note, this additional traffic is appears to be experienced by any client without a firewalled connection to the Internet. I'm now trying to understand how this additional traffic assists in the functioning of the Skype client. Thanks, all!

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