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Crystal
VoIP Engineer
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Competencies
Demonstrated experience with Asterisk.
Demonstrated experience with SIP.
Demonstrated experience with RTP.
Demonstrated experience with CUCM.
Demonstrated experience with Cisco IP Phones.
Summary
VoIP Engineer open to new opportunities
Experience
VoIP Engineer
Manage and troubleshoot Asterisk voice services and Cisco phones across district campuses, including SIP registration, endpoint provisioning, extensions, and calling features.. Trace call-routing and dial-plan problems, test inbound and outbound calls, and restore service when campus phones are not working as expected.. Support the district’s planned move from Asterisk to Webex Calling while keeping existing voice services operational.. Maintain E911 location and extension information, handle phone moves and changes, and work with on-site teams to verify network connectivity.
Network Engineer / Migration Engineer
Supported nationwide voice and network migrations, including USPS sites, by checking site readiness, equipment configurations, and cutover plans.. Checked router, switch, and session border controller configurations before and during multi-site cutovers.. Reviewed IP inventories and configurations to catch discrepancies before migration work.. Processed LNP port-in and port-out requests with 98% accuracy.
Sr. NOC Technician — Contract
Monitored DAS, RAN, core, backhaul, and IP transport alarms on Ericsson and Nokia networks in a 24/7 NOC.. Investigated UPS, rectifier, and generator failover alarms that could affect network availability.. Coordinated with field technicians and vendors during outages, escalations, and equipment dispatches.. Troubleshot Tier 1 and Tier 2 incidents, isolating hardware alarms and network service problems.
Lab Network Technician
Staged, configured, and validated enterprise routers, switches, firewalls, access points, optical gear, and wireless controllers across Cisco, Juniper, Nokia, Ericsson, Aruba, Alcatel, Ciena, Fortinet, Meraki, and Cradlepoint platforms.. Installed and rack-stacked lab hardware, managed cabling and labeling, and documented assets in tracking systems.. Ran 24-hour soak, traffic-load, and failover testing to confirm equipment stability before release.. Configured Cradlepoint IBR/E routers for enterprise deployments, including SIM activation, APN setup, LTE/5G failover, and NetCloud policies.
Installation Systems Engineer
Deployed and tested enterprise voice and data services, including SIP trunks, hosted voice endpoints, and SD-WAN.. Troubleshot connectivity and voice-quality problems across Cisco, Aruba, Cradlepoint, Meraki, and Fortinet equipment, including VLAN, MTU, and QoS issues.. Resolved SIP registration, codec negotiation, and dial-plan problems during hosted PBX and SIP trunk deployments.. Performed Cradlepoint LTE/5G turn-up, including APN configuration, carrier band locking, and failover validation to maintain connectivity for business-critical services.
Network Analyst 3
Supported IP voice networks carrying 911 and NG911 calls, with a focus on service availability and emergency call routing.. Audited circuit paths, checked BGP/OSPF routing, and maintained softswitch translations to protect redundant call paths.. Tested SIP trunks, RTP media paths, and end-to-end emergency call delivery to PSAPs after service changes.. Worked with local exchange and wireless carriers to validate ANI/ALI records used for E911 location and routing.
Network Engineer
Configured CUCM route groups, route lists, and translation patterns to support call routing across SIP trunks, PSTN gateways, and inter-cluster trunks.. Performed SIP trunk provisioning, registration validation, and signaling trace analysis using Wireshark to troubleshoot call setup failures and media negotiation issues.. Collaborated with engineering teams on the implementation of voice dial-plan applications and calling features, supporting migration from legacy TDM infrastructure to IP-based voice platforms.
Voice Operations Technician
Managed SIP and TDM switch translations, dial-plan modifications, and trunk group provisioning to support seamless voice transport operations across the carrier network.. Supported TDM-to-IP migration projects, coordinating with engineering and provisioning teams to translate legacy circuit configurations into SIP-based equivalents.. Monitored voice network health and responded to Sonus and C20 softswitch alarms, restoring voice service-affecting issues within SLA windows.
System Engineer
Participated in major system implementations and software release updates, performing pre- and post-change validation testing to ensure service continuity.. Developed and maintained call-flow documentation and dial-plan specifications to support operations and future engineering changes.
VoIP Operations Engineer
Managed VoIP routing configurations, SIP trunk activations, and voice-to-VoIP translations for enterprise-scale deployments on BroadSoft and Metaswitch platforms.. Resolved Tier 2/3 voice incidents including SIP registration failures, codec negotiation issues, RTP media path problems, and trunk capacity saturation events.. Coordinated with engineering and product teams on new feature rollouts, platform upgrades, and capacity expansions across the Comcast voice network.