UML,C, C++,Java,C#
ISDN, E1 CAS, T1, TAPI,GSM ATCMD/RIL
SIP,RTP/RTCP, Audio/Video codecs
TCP/IP stack (SMTP,NNTP, HTTP, FTP)
Digital and analog telephony, voice and data integration, VoIP, signaling protocols, CTI
systems
Network management and monitoring, high availability and fault tolerance
Telecommunication equipment (phone switches, modems, multiplexers, channel banks, CTI
platforms, VoIP gateways