VOIP Developer

Guest-tek India; Gurugram District; On-site; INR 800,000 - 1,200,000; Full time

Job summary

Guest-tek India is looking for a skilled developer to design and develop scalable solutions for reliable SIP services in Gurugram. Ideal candidates should have extensive experience with VoIP applications and proficiency in Asterisk, PHP, and AWS environments.

The role involves developing custom tools for automating voice stack configurations and enhancing existing code, with a comprehensive understanding of SIP protocols and networking.

Qualifications

• 4+ years of experience developing VoIP Applications and Integrations.
• Proficient with configuring Asterisk, including writing dialplan and custom application code.
• Familiarity with AWS environments, including EC2 instance management.

Responsibilities

• Design and develop scalable solutions for SIP services.
• Enhance existing code and participate in design reviews.
• Create tools to automate configuration of voice stacks.

Skills

Coding and debugging Asterisk source code

Highly proficient in PHP

Proficient understanding of SIP

Strong understanding of hosted environments

Experience with AWS

Education

University degree in Computer Engineering/Computer Science

Tools

Asterisk

Linux

MySQL

PHP

Perl

Job description

Job Description

Responsibilities

• Design and develop scalable solutions to deliver reliable SIP services to a multitude of distributed endpoints including on premise Call Processing Servers, SIP proxy servers, handsets, and soft-phones.
• Enhance and maintain existing code and participate in design reviews and code reviews with other team members.
• Create custom provisioning tools to automate configuration of voice stack.
• Participate in projects intended to improve infrastructure, including the integration of new systems and software.
• Draft technical documentation.
• Facilitate knowledge transfer to deployment and support teams.
• Work with the Production Services and Support leaders towards keeping Service Availability above target.
• Other duties as assigned by management.

Tools and Technologies

• SIP protocol and its use in VOIP Services.
• SIP proxies and/or SIP PBXs preferably open source products like Kamailio (OpenSER), FreeSWITCH, Asterisk, and FreePBX.
• Networking with Switches, Routers, Firewalls, IPSs and Security Appliances.
• Programming experience with PHP / Perl / JAVA / C and custom modules with open source products.
• Relational Databases (MySQL), JDBC / ODBC.
• Linux server operations, deployment and performance monitoring and shell scripting.

Qualifications

Education / Training:

• University degree in Computer Engineering, Computer Science or equivalent.

Mandatory Skills & Experience:

• Experience coding and debugging Asterisk source code.
• Highly proficient in PHP, Perl and MySQL.
• Knowledge of software design best practices.
• Proficient understanding of SIP, MGCP, H323.
• Strong understanding of a hosted, highly available environment.
• Proficient with configuring Asterisk, including writing dialplan and custom application code.
• Knowledge of common configuration methods of endpoints (TR-069, HTTPS, TFTP).
• Working knowledge of T1/E1/J1 interfaces, PRI/EuroISDN, CAS, R2 and other protocols.
• Working knowledge of Analog Telephony interfacing.
• Familiarity with Linux system administration.
• Familiarity with SQL Cluster configuration and administration (MariaDB/Galera a plus).
• Experience with a moderately complex AWS or similar environment, including VPC, subnetting in AWS, managing EC2 instances.
• Experience with formal change management.
• 4+ years of experience developing VoIP Applications and Integrations.

Nice to have:

• Solid understanding of Telecommunications best practices.
• Working knowledge of SAN environments.
• Experience inspecting network traffic from a voice perspective.
• Experience trouble shooting conventional, optical and wireless backbone.
• Experience using Visio or similar applications to build network, telecom and call flow diagrams.
• Experience configuring Kamailio SIP or similar server.
• Experience configuring Oracle Acme packet SBC.
• Experience with DevOps tools and methodologies, particularly with Puppet.
• Experience with various Property Management System (PMS) interfacing and development.
• Experience with Hospitality Call Accounting interfacing.
• Knowledge of wire shark or similar products.
• Familiarity with enterprise monitoring and logging platforms (Zabbix, Nagios, Cacti).
• Familiarity with basic layer 2/3 networking, including subnetting, assigning IPs, etc.

Personal Attributes

• Possess excellent written and verbal communication capabilities.
• Problem solver that can work both independently and as a member of a team.
• Ability to work well under pressure in a constantly changing environment with minimal supervision.
• Driven by intellectual curiosity and focused on excellence in service delivery.