Strong programming skills in C/C++
Hands-on experience with:
SIP protocol (call flows, signaling)
VoIP systems
SIP stack / SIP UA
Experience with FreeSWITCH or similar VoIP platforms
Knowledge of:
RTP/RTCP
Media handling and codecs
Experience with SIP gateways & SBCs
Good-to-Have
Experience with telecom or unified communications systems
Debugging tools like Wireshark for SIP tracing
Linux/Unix development environment
Exposure to real-time communication systems