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Careers with InPhonex

Senior VoIP Systems Engineer


Job Description and Requirements

Plan, design, build, test, debug, implement, maintain custom VoIP based infrastructure. Responsibility of building and leading a team of engineers/programmers that will grow with the company.


  • Through understanding of SIPv2 protocol and related network components (Proxy, SBC, Softswitch, etc.)
  • Through understanding of IP based network systems and protocols
  • Understanding of NAT, PAT, Firewall issues as they relate to VoIP
  • Ability to trace and troubleshoot VoIP sessions at the packet level
  • Working knowledge of C, Perl, PHP
  • Experience with Asterisk and Sip Express Router (SER) at the source code level
  • Experience with Cisco IOS Voice routers (Dial-Peer, H.323, ISDN, etc.)
  • Experience in interfacing with call routing / rating / billing systems
  • Understanding of Linux based operating systems
  • Experience with RDBMS (MySQL a plus)
  • Experience with high availability clustering and load balancing




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Our Home Phone Service includes Internet phones with free Internet calling and unlimited US and Canada plans. We offer prepaid phone service and International DID numbers using our voice over IP system and an analog telephone adaptor (ATA). The solutions are designed for home phone service, business phone service, call shops, telemarketing firms and cyber cafes. InPhonex is proud to support Internet telephony equipment (IP Phones) including Sipura 2000, Sipura 3000, Cisco 186, Linksys PAP2 and other SIP phone adaptors. We also support Asterisk PBX, Trixbox and offer turn-key VoIP Reseller business opportunities to let entrepreneurs and businesses resell voice over Internet (VoIP) under their brand name.

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