Remote: SIP Engineer

Operations Remote - United States Los Angeles, California


Position at J2 Cloud Services

Reporting to the Manager of SIP Operations, the SIP Engineer is responsible for the configuration and support of systems related to SIP call delivery and associated services, as well as serving as a technical escalation point for support and project issues.  The SIP Engineer is required to possess deep knowledge of VoIP devices, architecture and operations, as well as advanced expertise triaging and resolving issues while working with internal customers and external service providers.

The successful candidate will be able to demonstrate a strong track record of proven results, encompassing both the required technical and project delivery skills.

The SIP Engineer must be able to work with minimal supervision. Communication skills and time management are essential to success in this position


  • Provide expert support for SIP/telephony application infrastructure:  Asterisk, FreeSwitch/OpenSIPS, HMP APIs, etc…
  • Provide expert level analysis of SIP call flows, including problem isolation and resolution
  • Create structured testing/replication methodology and summary finding reports to support issue resolution
  • Interact and cooperate with carriers and partners to continually improve call delivery reliability and quality
  • Support open-source as well as proprietary applications
  • Evaluate new hardware, software and services specific to SIP call handling and delivery, and present recommendations along with supporting documentation to facilitate purchasing decisions
  • Develop, implement, and maintain script-tooling and applications in shell-script, Perl, Python, PHP, or other scripting languages
  • Manage tasks and projects and ensure all items are tracked in the ticketing system and being handled in a manner that meets or exceeds established SLAs
  • Handle multiple simultaneous competing priorities and deliver solutions in a timely manner
  • Must be available for on call rotation and possible travel when needed
  • Perform all other job duties as assigned

Other Responsibilities:

  • Resolve assigned trouble tickets and maintain accurate status in the company ticketing system 
  • Prepare documentation, status reporting, policies, procedures, and reports for the management team
  • Provide customer service to internal customers
  • Promote teamwork within the team and foster cooperation with other groups and departments
  • Demonstrate initiative and dedication, as well as an ability to work independently once general direction is given
  • Provide detailed information through effective written and verbal communication
  • Participate in and enforce the change control and production control processes


  • 2+ years of hands-on Session Initiation Protocol (SIP) experience
  • 2+ years hands-on UNIX/Linux system administrator experience
  • 2+ years of experience with Linux-based telephony applications: HMP, Asterisk, SIP, VoIP/FoIP, OpenSIPS, Freeswitch
  • Excellent written and spoken communication skills are required.  Candidate must supply writing samples related to previous job experience, redacted to protect proprietary information of previous employers
  • Experience with the following is highly desirable:
    • T.30 and T.38 faxing protocols
    • Cloud computing (AWS, Azure, etc...)
    • Operating and troubleshooting enterprise scale SIP communications platforms
  • Experience with any of the following is desirable: ElasticSearch, Puppet, Postfix, Zabbix, DataDog, Graphana, Nagios scripting, Fax/Voice Server Hardware, Perl, Python, PHP, Disaster Recovery
  • Advanced Ability to:
    • Assess necessary activities and prioritize for completion of assignments using excellent time management, prioritization skills, and work ethic
    • Interface effectively with various levels of employees
    • Learn multiple aspects of existing, newly-added, or planned voice/fax platforms and understand how they all connect
    • Solve problems by considering available information, prioritizing, and making timely decisions; correlate data and understand business and technology tools and approaches, spot trends, and apply sound management principles
    • Work individually, within a team, and with other groups
  • Multi-tasking, self-motivated and project oriented. Previous project management experience is desirable
  • Bachelor’s degree or equivalent experience recommended