Extensive Asterisk expirence, SwitchVox, NetSapiens, Adtrans, Audiocodes Setting up and managing Asterisk systems & complex call routing. Digium Asterisk & Switchvox certified Setting up and managing SIP Phones, Cisco, LinkSys, Polycom, Aastra, Grandstream Setting up and managing SIP/RTP SBC/Proxy systems, SIP packet debuging.