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W Peter H.
Expert-Vetted

W Peter H.

VoIP Engineer - AI Agents - FreePBX - SMS - AWS

Top-Rated, Expert-Vetted VoIP & AI Voice Automation Engineer with 20+ years of experience designing high-availability telephony systems and AI-powered phone agents that handle real conversations in real time. I help businesses modernize how they handle inbound calls by replacing outdated IVRs and manual call handling with natural, efficient, AI-driven voice interactions. Whether you need to automate customer support, qualify leads, route calls intelligently, or integrate voice systems with CRMs and internal workflows, I can architect and deploy the end-to-end solution. Core Specialties • AI Phone Agents (LLM + STT + TTS) with barge-in, memory, and real-time context switching • Asterisk / FreePBX / Kamailio / RTPengine architecture, scaling, and troubleshooting • SIP trunking, call routing, failover, load balancing, SBC architecture • SMS/MMS integration and automated messaging workflows • Linux, AWS, secure network design, and HA deployments • Custom APIs, CRM integrations, call event webhooks, and data pipelines What I Deliver • Voice agents that sound natural and respond instantly • Call flows that handle interruptions and human behavior (not just scripts) • Seamless integration with business applications (CRM, billing, scheduling, etc.) • Reliable, secure, production-grade VoIP environments • Clear documentation, long-term maintainability, and zero vendor lock-in Experience Highlights • Developed high-availability telephony infrastructure at TeleConnx Inc. • Built privacy-focused communication platforms for Mecca Hosting, Inc. • Created enterprise-grade AI voice automation for Nomo • Led development engineering efforts supporting mission-critical systems at Lockheed Martin • Managed large-scale Linux server fleets and network operations at IBM I work efficiently, communicate clearly, and always deliver solutions that are fast, reliable, and built to scale. If you have a complex or time-sensitive project, I’m the engineer you want on it. If you’re looking to: • Add AI intelligence to your phone system • Replace manual call center interactions • Improve reliability, routing logic, or call quality • Integrate voice + SMS + automation into a single workflow • Or rescue a failing telephony deployment Let’s talk — I can help.

🇺🇸Florissant, United States$70/hr90% JSS4.96 (96)Since May 2016

Earnings and projects

MRR
$6

Last 6 months ÷ 6

World#176,437 / 412k
🇺🇸Country#23,060 / 62.1k
Revenue, last 30 days
$0

Last 6 months: $33

Total earnings
$402k

Billed in all: $412k

World#4,382 / 412k
🇺🇸Country#1,341 / 62.1k
Per project
$1.6k

$17 in the last 6 months

World#92,044 / 412k
🇺🇸Country#15,574 / 62.1k
Projects, last 6 months
2
0% fixed100% hourly
World#88,918 / 412k
🇺🇸Country#11,762 / 62.1k
Projects in all
256

Across 291 contracts

24% fixed76% hourly
World#6,479 / 412k
🇺🇸Country#1,181 / 62.1k

Earnings, last 30 days

$412kNothing earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$405k$410k$415k$420kOct 8Oct 23Nov 7

Skill rankings: Top 29% in C

Ranked by MRR among everyone on Upwork with the skill.

  1. #19Kamailio45 freelancers · 🇺🇸 #1Top 42%
  2. #41FreePBX120 freelancers · 🇺🇸 #5Top 34%
  3. #51Session Initiation Protocol106 freelancers · 🇺🇸 #6Top 48%
  4. #54LAMP Administration174 freelancers · 🇺🇸 #9Top 31%
  5. #75Asterisk211 freelancers · 🇺🇸 #7Top 36%
  6. #77VoIP Software176 freelancers · 🇺🇸 #6Top 44%
  7. #92VoIP Administration218 freelancers · 🇺🇸 #11Top 42%
  8. #149Business with 10-99 Employees358 freelancers · 🇺🇸 #32Top 42%