VoIP

About the job and department

Bahnhof’s customers should be able to easily communicate with each other and the rest of the world via telephone, mobile, chat, online meetings, e-mails and but also future methods that have not yet been invented. In order to stay on top as an Internet provider, we must provide stable and secure services as well as develop tomorrow's communication solutions, and be ready to deliver them when the demand arises.

Responsibilities

maintenance and development of SIP core network

development of new telephony clusters

identifying and fixing of problems/bugs in telephony systems

development of an attendant functionality (billing / accounting / etc.)

Scope of the position

Full-time, starting with 6 months probationary employment.

Good knowledge of signaling and media protocols SIP, SDP, RTP / RTCP

Experience with SIP architecture: SBC, B2BUA. Routing, Accounting, CDR

Experience with linux based server environment

SER: OpenSIPs, Kamailio

RTP: RTPproxy, RTPEngine

Asterisk: B2B user agents, Media Proxy servers. Voice mailing, IVR

Database: MySQL, PostgreSQL, Redis

Logging: heplify, HEP, Homer, Grafana + Prometheus

Monitoring: NRPE agent, Nagios

Experience of programming in Python would be a plus

Experience in troubleshooting SIP / SDP / RTP related issues

Knowledge of IP networking (TCP/IP stack) would be a plus

Experience in building and managing systems within existing SIP core environment.

Experience in programming in C or Ruby on Rails would be a plus.

Fluent oral and written english is a must

About Bahnhof AB

About Bahnhof AB

Bahnhof has been delivering fast, secure and affordable internet services to individuals and businesses since 1994, and is today one of Sweden’s leading internet and telecom providers with over 400,000 customers.

We offer our customers maximum security against surveillance, corporate espionage and leaks — something that is becoming increasingly important as society goes digital. With our own fibre network, we guarantee fast and reliable access to our cloud services and data centres wherever you are.