Reducing the media port range on an Office Communications Mediation Server
By default the number of ports the mediation server will use is 4000 in the range of 60,000 to 64,000.
This is to allow for 1,000 concurrent users. I had an issue opening up this many ports both udp/tcp.
Especially; if we are no where large enough to have 1,000 concurrent users on the system.
So I lowered ours settings down to 400 ports, range 60,000 to 60,400. This will allow for 100 concurrent calls. I then only have to open up 400 ports, much more acceptable by myself and our security team.
This option is set in the Graphical User interface, under:
Forest->mediation Server –FQDN (Mediation Server)
Right Click -> properties (you should see the screen below)
* As noted in the Media Port Range Server Allocation
For a Mediation Server, the port range must be at least four times the maximum number of concurrent calls that can be supported on the server (two ports for the RTP and RTCP traffic for audio multiplied by two because the Mediation Server is a back-to-back User Agent).
** As noted in the OCS_VOIP_Guide Pg 100
Important
The default range media port range enables the server to handle up to 1000 simultaneous calls. Reducing the port range greatly reduces server capacity and should be undertaken only for specific reasons by an administrator who is knowledgeable about media port requirements, and scenarios. For this reasons, altering the default port range is not generally recommended.
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