Verification Office Certification Test Engineer

    • Job Tracking ID: 512052-605497
    • Job Location: Prague, CZE
    • Job Level: Mid Career (2+ years)
    • Level of Education: BA/BS
    • Job Type: Full-Time/Regular
    • Years of Experience: 2 - 5 Years
    • Starting Date: May 1, 2018
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Job Description:

About Sonus:

Sonus brings the next generation of Cloud-based SIP and 4G/VoLTE solutions to its customers by enabling and securing mission critical traffic for VoIP, video, IM and online collaboration. With Sonus, enterprises can intelligently secure and prioritize real-time communications, while service providers can deliver reliable, secure real-time services for mobile, UC and social applications. Sonus offers an award-winning portfolio of hardware-based and virtualized Session Border Controllers (SBCs), Diameter Signaling Controllers (DSCs), Network-as-a-Service (NaaS) capabilities, Policy/Routing servers and media/signaling gateways.

Position Summary:

The Certification Test Engineer will function as a test engineer and shall carry the following responsibility:

 ·       Design, implement and test specific telecommunications lab environments employing Ribbon and non-Ribbon components for the purpose of validating interoperability with various SIP service provider (SP) SIP trunking services.

·       Interface with SP and 3rd Party Vendor personnel to coordinate test definition, execution and results acceptance.

·       Configure and integrate third-party vendor equipment and applications into testing environment, as required.

·       Develop test strategies and test plans based on interoperability testing requirements.

·       Develop test cases in accordance with SP and/or 3rd Party Vendor requirements.

·       Execute test cases and document test results using accepted practices

·       Report found defects to Engineering for resolution.

·       Work with Engineering to verify resolution of identified software defects

·       Work with Certification Technical Writer to develop professional quality AppNotes for public consumption.


Experience and Skills:

The Certification Test Engineer must possess the following skills:


·       Excellent communication and organizational skills, and possess the ability to interface with Ribbon’s partners, third party vendors and SPs.

·       Fluent in English language.

·       Knowledge of the principles of SBC functionality a must

·       Experience with Ribbon SBC family a plus

·       Knowledge of Access Control List (ACL) principles a plus

·       Knowledge of Internet layer protocols such as IPv4, IPv6, and ICMP etc. is required

·       Extensive experience with telephony networking protocols SIP, RTP SRTP is required

·       Extensive experience with transports such as UDP, TCP, TLS is required

·       Extensive knowledge of message capturing and filtering using tools such as Wireshark

·       Experience with large-scale telephony software architecture and implementation is a plus

·       Knowledge of enterprise communications systems such as Avaya CM & ASM, Cisco UCM, MS Skype for Business, BroadSoft BroadWorks and Genesys SIP Server a plus.

·       Strong knowledge of Linux and Unix operating systems and syntax.

·       Knowledge of Network Protocols: Ethernet (802.1q, 802.3ad, etc.) is a plus

·       Shell scripting (Perl, KSH, CSH, and BASH) and process automation knowledge a plus

·       MySQL and/or Oracle experience a plus

·       Strong analytical and communication skills, and a proven history of delivering high quality work

·       BS in Engineering or related field preferred

·       Experience may be substituted for some of educational requirement but shall be determined case by case