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We need to get some configuration work on Freeswitch as follows ,
1.Create 4 SIP users
2.Add Gateway for call termination and create a dial plan for that
3.Install G729 , preferable open souce version
4.Enable ZRTP on a different port other than 5060
This work will be carried out on a test server , once you done this you need to give us a document how to do this in our production server.
Please bid only experience freelancers.