Senior VoIP Engineer — VoIP Operations
On-siteLahore, Punjab, Pakistan
Job Summary
Operate, secure, and optimize enterprise VoIP, contact center, and messaging platforms across Asterisk/FreePBX, hosted PBX, carrier, and AWS environments. Perform SIP and RTP troubleshooting, voice-quality monitoring, and Tier-2/Tier-3 production support while managing SIP trunks, PSTN connectivity, and carrier integrations. Maintain network reachability, NAT traversal, and QoS configurations to ensure stable RTP/SIP traffic, and build integrations between telephony systems and internal AI tools, Dynamics 365, and web applications. Write Python and Bash automation for provisioning, configuration management, and CDR processing, while participating in an on-call rotation for production services.
Required Qualifications
- Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field
- 3-5 years of experience in enterprise voice engineering
- experience working with Linux-based telephony platforms
- scripting or programming languages for automation and system integration
- Good understanding of Linux environments
- shell scripting
- configuration
- system backups
- Strong experience with Asterisk
- Strong experience with FreeSWITCH
- Strong experience with Kamailio/OpenSIPS
- SIP proxies
- other open-source VoIP platforms
- Working knowledge of WebRTC-based voice & video communication
- open-source VoIP ecosystems
- Deep understanding of SIP signaling
- RTP/SRTP
- DTMF
- codecs
- NAT traversal
- fax (T.38/Passthrough) troubleshooting
- Strong knowledge of SIP trunking
- carrier interconnects
- DID provisioning
- number portability
- E911
- telecom regulations
- Experience implementing high availability (HA)
- redundancy
- failover
- disaster recovery
- business continuity solutions
- mission-critical voice platforms
- Ability to interpret system diagrams
- architecture blueprints
- call flows
- carrier workflows
- on-premises and cloud environments
- Excellent verbal and written communication skills
Desired Qualifications
- experience with AWS — EC2, VPC, security groups, Route 53, S3, CloudWatch, and related services
- Maintain network reachability
- NAT traversal
- firewall
- QoS configurations
- Manage backups, snapshots, patching
- disaster-recovery procedures
- Build and maintain integrations between Asterisk and Custom in-house VOIP Portals
- Dynamics 365
- click-to-call
- screen-pop
- call logging
- contact sync
- CDR push
- Integrate telephony with internal and third-party AI systems
- voicebots
- transcription
- sentiment analysis
- AI dialers
- IVR automation
- Operate and maintain messaging services across 10DLC SMS
- longcode
- shortcode
- fax
- carrier registration
- brand/campaign compliance
- throughput management
- DLR reconciliation
- Maintain and support in-house web applications built on Laravel
- bug fixes
- minor enhancements
- deployment
- operational support
- ability to navigate, debug, and modify the codebase
- Write Python and Bash automation
- provisioning
- configuration management
- log parsing
- CDR processing
- health checks
- recurring operational tasks
- Develop scripts and small tools that integrate Asterisk AMI/ARI
- REST APIs (HubSpot, Dynamics, 3CX, GoToConnect, SMS gateways)
- internal services
- Build dashboards, alerting, and runbooks using tools such as Grafana
- Zabbix/Nagios
- Homer
- sngrep
- CloudWatch
- Reduce manual operations through automation
- provisioning
- user onboarding/offboarding
- trunk failover
- routine audits
- Harden VoIP and messaging infrastructure against toll fraud
- SIP scanning
- brute-force attempts
- abuse
- manage TLS/SRTP
- fail2ban
- ACLs
- rate limits
- Ensure adherence to 10DLC, CTIA, and TCPA requirements
- applicable regulations for voice (E911 where relevant)
- Maintain accurate, version-controlled technical documentation
- network diagrams
- runbooks
- SOPs
- Act as Tier-2/Tier-3 escalation for voice, messaging, and integration incidents
- Partner with development, NOC, and contact-center teams
- rollouts
- migrations
- continuous improvement
- Participate in an on-call rotation for production voice and messaging services
Hiring someone like this?
Get your role in front of qualified candidates on Sorce.