SIP/VoIP Specialist

This full time on-site position is for a US based tech firm Bell Oceanic Communications, our allied company.

Core Expertise

• SIP Protocol Mastery – In-depth understanding of Session Initiation Protocol (SIP), RTP, and related VoIP signaling protocols.
• Number Routing & Call Flow Management – Experience configuring and managing DID number routing, call forwarding rules, least-cost routing (LCR), and failover mechanisms. VoIP Server Administration – Strong hands-on expertise with SIP servers such as Asterisk, FreeSWITCH, Kamailio, OpenSIPS, or FreePBX.
• Server-Side Management – Ability to deploy, configure, and maintain SIP/VoIP servers on Linux-based environments.
• SIP Trunking – Setup and management of SIP trunks, carrier interconnections, and termination/origination routes.
• NAT & Firewall Traversal – Understanding of SBCs (Session Border Controllers), NAT traversal, and firewall configurations for SIP stability.

Technical Skills

• Linux Server Administration – Strong command-line and system optimization skills. Database Integration – Experience with MySQL/PostgreSQL for routing tables and billing integration.
• Monitoring & Troubleshooting – Proficiency with SIP trace/debugging tools (Wireshark, sngrep, tcpdump).
• Security & Compliance – SIP server hardening, TLS/SRTP implementation, fraud detection, and call authentication.
• Load Balancing & High Availability – Knowledge of clustering, scaling, and redundancy in SIP environments.

Additional Knowledge (Preferred)

• VoIP Billing Systems – Integration with billing engines like ASTPP, FusionPBX, or custom solutions.
• API Development – REST/SOAP APIs for real-time call control and number provisioning.
• Cloud & Virtualization – Experience deploying SIP solutions on AWS, Azure, or private cloud (Docker, Kubernetes).
• QoS & Monitoring – Ensuring call quality (MOS score), jitter, latency management, and using monitoring platforms like Zabbix or Grafana.

Soft Skills

• Strong problem-solving and analytical skills. Ability to document call flows, routing policies, and server configurations.
• Team collaboration with developers, network engineers, and support teams.
• Client-focused approach with attention to uptime and call quality.

Job Type: Full-time

Pay: Rs100,000.00 - Rs200,000.00 per month

Ability to commute/relocate:

• Rawalpindi Satellite Town: Reliably commute or planning to relocate before starting work (Preferred)

Application Question(s):

• What is your current or past Salary package ( actual and with proofs)
• Explain your experience briefly related to our Job description
• Are you willing to work in evening shift from 1PM-10PM Pakistan time?

Education:

• Bachelor's (Preferred)

Experience:

• SIP/ VOIP and total industry: 2 years (Preferred)

Language:

• English (Preferred)

Work Location: In person