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90,000+ live jobsTelephony Systems Administrator
Hybrid in Madrid·Full-time·Added yesterday (last checked 13 Nov)
Our summary
- Hours
- Jornada intensiva on Fridays and in summer
- Work mode
- Hybrid, Madrid
- Contract
- Permanent, full-time hours
- Spanish
- Expected (ad in Spanish)
- Experience
- 5+ years
- Education
- Higher vocational training (FP Grado Superior)
- Benefits
- Private health insurance, flexible pay plan, meal vouchers
Visa options
The ad rules out sponsorship
The advert says visa sponsorship isn’t available for this role.
Skills
This job advert was originally written in Spanish.
Requirements
What we're looking for
Education:
- Higher Technician in Telecommunications and Computer Systems or Network Computer Systems administration, or equivalent training.
- At least 5 years of professional experience in the administration and operation of corporate IP telephony platforms
- At least 3 years of specific experience in Asterisk environments, including administration of extensions, SIP trunks, dialplans, IVR, and voicemail.
- At least 3 years of experience in the administration of Asterisk technologies
- At least 3 years of experience in VoIP protocols and communications (SIP, QoS, interconnection between operators and VoIP platforms).
- Minimum of 1 year of experience in Linux systems, TCP/IP networks, and SIP/RTP communication diagnosis using Wireshark or an equivalent tool.
Nice to have
- Official Asterisk certifications.
- Cisco CCNA, Cisco Collaboration, or equivalents.
- Certifications in SBC technologies or SIP communications.
- Linux or systems administration certifications.
- Certification or training in Microsoft Teams Phone Administration
Pay & benefits
What you'll get
Permanent contract from day one.
Flexible schedule with reduced working hours on Fridays.
Intensive working hours during the months of July and August.
22 working days of vacation, the day of your birthday, and the 24th and 31st of
December.
Flexible compensation with options such as medical insurance, meal vouchers, transport, and childcare.
Free English classes.
Access to a catalog of benefits and discounts.
The role
At Izertis, we are looking to expand our team by bringing on a Telephony Systems Administrator to be part of a stable project for one of our largest clients in the public sector.
What you'll do
- General operation and administration of the service.
- Monitoring of systems
- Management of incidents and requests, both reactively and proactively.
- Execution of maintenance and improvement tasks.
- Management of configurations and changes to the infrastructure.
- Direct contact with manufacturer support, operators, and related third parties.
- Preparation and maintenance of technical and operational documentation, including processes, procedures, manuals, and reports.
- Administration of Asterisk platforms.
Provision of administration, operation, support, and evolution services for the client's Asterisk telephony platform, including:
- Configuration and maintenance of the dialplan, inbound and outbound routes.
- Configuration and maintenance of users, extensions, and phones.
- Configuration and maintenance of queues, auto attendant, and IVR services.
- Configuration, administration, and maintenance of SIP trunks and associated SBCs, responsible for interconnecting the telephony platform with various service providers.
- Administration and maintenance of the databases associated with the platform.
- Management and resolution of requests and incidents related to the platform and its integrations.
- Documentation of configurations, changes, operating procedures, and relevant incidents.
- Platform updating and maintenance
- VoIP interconnection and communications.
- Integration of the Asterisk platform with operators, corporate networks, and Microsoft Teams.
- Administration, configuration, and maintenance of SIP trunks, as well as management of Quality of Service (QoS) parameters
- Analysis and diagnosis of communications.
- Capture and analysis of SIP/RTP traffic using Wireshark and review of logs and traces from the Asterisk console.
- Identification of the causes of failed calls, drops, delays, echo, audio loss, or one-way audio.
- Preparation of technical reports, documentation of findings, and proposals for solutions or improvements.
- SBC infrastructure administration.
- Administration, configuration, maintenance, and security of the SBC infrastructure and SIP sessions.
- Management of interoperability, routing, monitoring, and quality of service.
- Associated connectivity infrastructures
How you'll work
In Madrid attending the client's office, where you will work under a hybrid model.
About Izertis
Izertis is a Spanish technology consulting and engineering firm specializing in digital transformation, software development, and IT services. The company operates across multiple sectors including public administration, healthcare, industry, and financial services, offering solutions in areas such as cloud computing, cybersecurity, data analytics, and enterprise software implementation. With a workforce of over 1,000 professionals, Izertis has established itself as a significant player in the Spanish and European tech consulting market.
Izertis has a strong presence in Spain, with its headquarters in Gijón and additional offices in Madrid, Barcelona, and other major cities. The company is known for its commitment to talent development, offering programs like 'FutureWave' for junior talent and fostering a collaborative and innovative work culture. For international professionals, Izertis provides opportunities to work on diverse projects with a Spanish-speaking client base, making it an attractive option for those looking to build a career in Spain's growing tech sector.
- Industry
- IT Consulting
- Founded
- 1996
- Employees
- 1,000–5,000
- Headquarters
- Gijón, Spain
- In Spain
- Gijón, Madrid, Barcelona and 2 more
Good to know if you are moving
- Izertis has a formal 'FutureWave' program designed to attract and develop junior tech talent, offering structured career paths for recent graduates.
- The company works with a wide range of clients, including public administrations, which can provide exposure to large-scale digital transformation projects.
- While Spanish is the primary working language, the company's international projects may offer opportunities for English-speaking professionals.
- The company has offices in several Spanish cities, offering flexibility for those who may prefer living in a larger city like Madrid or Barcelona.
- Izertis is a Spanish company, which can be an advantage for internationals looking to integrate into the local tech ecosystem.
In their own words
About the company & team
At Izertis, we drive the digital transformation of companies, organizations, and people through customized, innovative, and impactful technological solutions.
Founded in 1996, with 30 years of history and included in the BME Continuous Market, izertis is consolidated as one of the 1,000 fastest-growing companies among European countries. Currently, we are more than 2,700 professionals distributed across offices in Europe, America, and Africa, with a presence in more than 50 countries where we provide services and projects through a wide portfolio of solutions such as: Software Engineering; Consultancy & Governance; Cloud & Infrastructure; Cybersecurity; IA & Data & Emerging Technologies; CX & Business Solutions and other technologies enabling transformation processes.
And you, would you like to join our team? If so, don't hesitate to apply so that the Talent team can get to know you!
Also, don't forget to check the job offers section of our website for other options that may be interesting to you:
https://www.izertis.com/es/talento
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