Building a programmable voice client with Python, PJSIP and VoIPstudio (Part 2)

Connecting Python (PJSIP) to VoIPstudio in 30 minutes

This guide follows on from AI-powered voice assistant with Python, PJSIP and VoIPstudio (Part 1) and walks through the basic steps required to build a programmable SIP client using Python and connect it to VoIPstudio. Examples based on an open-source project developed by Luis Miguel.

Step 1: Create a VoIPstudio account

1. Sign up for a free trial.
2. Create a SIP extension.
3. Note the following credentials:
4. • SIP Username
   • SIP Password
   • SIP Domain (e.g. sip.voipstudio.com)

These credentials will be used for registration.

Step 2: Clone the open-source client

Clone locally:

1git clone https://github.com/luismiguelbp/voip-client-python.git
2cd voip-client-python
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This project already includes:

• SIP account registration logic
• Call initiation handling
• Media stream management
• Event callbacks

Step 4: Place an outbound call

Minimal example:

1call = MyCall(account, pj.CallOpParam(True))
2call.makeCall("sip:+441234567890@sip.voipstudio.com", pj.CallOpParam(True))
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From here you can:

• Inject pre-recorded audio
• Generate speech dynamically
• Attach real-time AI logic
• Process inbound audio streams

Step 5: Extend with AI

You now have a programmable voice channel.

From this point you can integrate:

• Speech-to-text engines
• LLM-driven conversational models
• Custom escalation workflows
• Dynamic IVR trees

VoIPstudio handles:

• SIP transport
• Call routing
• PSTN connectivity
• Global number provisioning

You control the intelligence layer.

Deployment options

Because the client is standards-based SIP, it can run:

• On-premise (industrial environments)
• On a Linux server
• In a Docker container
• In a cloud VM
• Inside a larger automation platform

No proprietary telephony SDK is required.

Why this approach scales

Many AI voice platforms tightly couple intelligence and telephony.

This architecture separates them:

• AI can evolve independently.
• Telephony infrastructure remains stable.
• Developers maintain full protocol-level control.

For system integrators and infrastructure engineers, this reduces long-term lock-in risk.

Next steps

• Fork the repository.
• Connect it to your VoIPstudio trial.
• Build your first programmable voice workflow.

If you need SIP trunking at scale or global number provisioning, VoIPstudio provides the transport layer.