Senior VOIP Developer

Desired Skills Good understanding of TCP / IP protocol stack and practical knowledge of VLAN / L3 VPNs

Very good knowledge on SIP / SDP protocol / RTP / SRTP / TLS protocols

Must have knowledge in OpenSIPS or Kamailio

Must have experience with C / C++ programming language

Must have knowledge in diameter

Experience in MySQL, MongoDB

Knowledge of IMS call flow

Standard features of Enterprise Communication Servers (PBXs)

Problem Troubleshooting and debugging techniques

Review work of resources

Good in Written and verbal communication

Nice to Have Inter-process communication, API design, message queues

Experience in Freeswitch, Asterisk

Experience in building any of softPBX, Voicemail, ACD, IVRS these applications

Experience in any of the programming languages like Python, PHP, Javascript, Java

Knowledge of Linux / server administration

Experience in Linux and Linux commands line tools

Firewall, Security

Tools cmake, git