1- I have successfully installed, configured and administered VoIP servers for more than 5 times for different companies 2- I have experience of managing more than 500+ DIDs on single server 3- Having different dialplan Against each DID 4- Providing special features like Call forwarding to mobile or landline in case of extensions are down, Voicemail, call transfer, CDRs, Call Recordings 5- Successfully communicated between linux servers