A practical, production-ready guide to configuring BSNL SIP PRI (IMS SIP Trunk) on modern Asterisk (PJSIP) with OpenVPN. Covers authentication, routing, user_eq_phone, scoring logic, debugging, and real-world carrier behavior. BSNL now delivers SIP PRI over FTTH fiber using IMS-based SIP signaling routed through VPN (OpenVPN or SoftEther). Key realities: SIP Proxy is reachable only via VPN SIP authentication may use: IMS expects proper user=phone format RTP may traverse different subnets If your PBX doesn’t support OpenVPN natively, you must deploy a router or gateway device that does. 🛠 Step 1 – Configure OpenVPN BSNL provides: VPN Server Primary IP VPN Server Secondary IP Virtual IP (Client) Gateway Mask After connecting: ip addr show tun0 ip route ping 10.x.x.x # SIP Proxy Ensure: VPN interface is UP Route to SIP proxy goes through VPN SIP proxy is reachable 🧩 Step 2 – Configure BSNL SIP Trunk (PJSIP – NOT chan_sip) Modern Asterisk uses PJSIP , not sip.conf. Below is a ...
Revolutionizing Client Communication: How AI Voice Automation is Transforming Industries Like Interior Design, Landscaping, and Real Estate
The future of client interaction is here, and it’s powered by AI. For businesses in industries like interior design, landscaping, and real estate, managing inbound calls efficiently is no longer a luxury—it’s a necessity. Enter AI voice automation, a game-changer that ensures no lead slips through the cracks while automating tedious backend workflows. But how do you build a system that’s both intelligent and reliable? Let’s dive into a real-world use case and break down the technical magic behind it.
The Vision: An AI Voice Agent That Acts Like Your Best Employee
Imagine an AI agent that:
Greets callers warmly.
Collects key details (name, phone, email, project type).
Schedules appointments via Google Calendar.
Sends confirmation emails.
Tracks usage, alerts clients about overages, and bills automatically.
This isn’t science fiction—it’s achievable today with the right tools and expertise. Let’s explore how to build it.
Q: How Would You Approach This Setup?
Step 1: Design the AI Agent Workflow
Use Vapi.ai to build the voice agent. Configure its conversational logic to ask questions like:
“Are you looking for residential or commercial services?”
“Would you like to book a call with our owner?”
Integrate Google Calendar API to let clients pick available slots.
Step 2: Automate Data & Alerts
Trigger Make.com (Integromat) workflows after every call to:
Log call details (name, number, reason, duration) to Google Sheets.
Calculate total minutes used per client.
Send email alerts (via SendGrid or Gmail) at 90% usage.
Step 3: Monthly Billing & Overage Charges
Use Stripe API to:
Generate invoices for overages.
Auto-charge cards at month-end.
Deploy Python scripts (or Make.com scenarios) to compile PDF reports from Google Sheets data.
Step 4: Scalability & Security
Store client API keys securely using AWS Secrets Manager or Google Cloud Key Management.
Ensure compliance with SOC-2 or GDPR if handling EU data.
Q: What Tools Would You Use?
Vapi.ai: For AI voice agent creation and call handling.
Make.com: To automate workflows (call logging, alerts, billing).
Google Sheets: Central database for call logs and client metrics.
Stripe: Payment processing for subscriptions + overages.
SendGrid: Transactional emails (alerts, confirmations).
Google Calendar API: Scheduling calls with business owners.
AWS Lambda/Google Cloud Functions: Serverless compute for custom logic (optional).
Q: How Long Would It Take?
Core Setup (Vapi + Google Sheets + Make.com): 10-15 hours.
Includes AI agent design, Google Sheets schema, and basic automation.Email Alerts & Calendar Integration: 5-8 hours.
Stripe Billing & Monthly Reports: 8-12 hours.
Testing & Debugging: 5-7 hours.
Total: ~30-40 hours (4-5 weeks part-time).
Q: What Would You Charge?
Freelancer Rate: 100/hour (based on expertise).
Project Estimate: 4,000 (fixed fee for end-to-end setup).
Long-Term Support: Optional 500/month for maintenance and scaling.
Why This Solution Stands Out
Industry-Specific Customization: Tailored scripts for interior designers (“Would you like a consultation for kitchen remodeling or full-home design?”) vs. landscapers (“Is this for lawn maintenance or a new installation?”).
Transparent Pricing: Clients only pay for what they use, with auto-upsell opportunities for higher-tier plans.
Zero Manual Work: From lead capture to billing, everything is automated—freeing businesses to focus on creative work.
Ready to Build Your AI Voice Agency?
This isn’t just a backend project—it’s a competitive edge for your clients. By combining Vapi’s conversational AI with bulletproof automation via Make.com and Stripe, you’ll deliver a system that’s:
✅ Scalable (handles 10 or 10,000 calls).
✅ Cost-Effective (no hiring full-time staff).
✅ Client-Friendly (real-time alerts, no billing surprises).
Let’s connect if you’re looking for a freelancer who can own this setup end-to-end. I’ll ensure your agency’s tech stack is as polished as the services your clients offer.
Tagging industries that need this: #InteriorDesign #Landscaping #RealEstate #AIAutomation #VoiceTech