Claude, GPT or Gemini? Choosing the AI Model Behind Your Jamaican Phone Receptionist

When businesses ask about AI receptionists, they often start with the model: “Can we use ChatGPT?” “Is Claude better?” “What about Gemini?” It is a good question, but it is the second one. A language model reads and writes text; it does not answer a telephone. To put a model on your Jamaican number you need a voice platform that handles the call, converts speech to text and back, and lets the model decide what to say.

WOCOM connects your number to that voice platform. Which model sits inside it is your choice, and you can usually change it later without touching the phone route.

Anthropic Claude

Claude has no phone line of its own: Anthropic offers it through an API, not over SIP. You use it inside a voice platform. Platforms that document Claude as a selectable model include:

• ElevenLabs Agents: Claude Haiku, Sonnet and Opus models are listed natively. ElevenLabs + WOCOM guide.
• Vapi: set the model provider to anthropic; Claude is also available through Amazon Bedrock. Vapi + WOCOM guide.
• Retell AI: Claude models appear in the model list. Retell retires older versions regularly, so check the dropdown. Retell + WOCOM guide.
• LiveKit Agents (the livekit-plugins-anthropic plugin) and Pipecat (AnthropicLLMService), for teams building their own. LiveKit and Pipecat guides.

Claude is known for following detailed instructions closely and for a careful tone, which suits receptionists that must stick to a policy, such as never quoting a price that is not in the knowledge base.

OpenAI GPT

OpenAI is the one model maker with its own SIP connection. Its Realtime and GPT-Live APIs can answer a call directly, with no separate voice platform. Read the OpenAI + WOCOM guide. GPT models are also available inside ElevenLabs, Vapi, Retell, LiveKit and Pipecat if you prefer one of those platforms' voices or tools.

The OpenAI realtime models are “speech-to-speech”: one model listens and speaks, which keeps replies fast and natural. The trade-off is that you are tied to OpenAI's voices.

Google Gemini

Gemini is available as the model inside ElevenLabs Agents, Retell, LiveKit and Pipecat, and that is the practical way to put Gemini on a Jamaican number. Google's Gemini Live API has no documented SIP endpoint of its own.

Google does offer phone connections for its contact-centre products (Dialogflow CX and CX Agent Studio), but they are built for large contact centres. They require Google to approve your project first, a certified session border controller from a short list of vendors, mutual TLS with certificates from specific authorities, and a dedicated port. That suits a bank or a large call centre with its own SBC, not a typical business line.

A Note on Microsoft Azure

Microsoft has announced the retirement of Azure Communication Services' own phone features, including Direct Routing for bring-your-own trunks. New customers have been restricted since October 2026, and support ends in September 2028. We do not recommend starting a new Azure-based phone AI project on that route. If your business runs on Microsoft 365, Teams Direct Routing is the supported path; see our Teams Direct Routing guide.

What Actually Changes When You Switch Models

• Response time. On a phone call, a reply that takes two seconds feels slow. Smaller, faster models (Claude Haiku, GPT mini models, Gemini Flash) often make a better receptionist than the largest ones.
• Following the script. Some models stay closer to your instructions than others. Test the questions where a wrong answer would cost you: prices, opening hours, policies.
• Cost. Model usage is usually the largest part of the per-minute cost on platforms that pass it through.
• Not the voice or the hearing. How the agent sounds and how well it hears Jamaican names depend on the voice and speech-recognition components, not the language model.

How to Choose

Pick the platform first: it decides how calls connect, what tools the agent has and how you manage it. Then run the same ten test calls with two or three models, and choose on what your callers would notice: speed, accuracy and tone. Because the WOCOM route points at the platform, not the model, you can switch later without changing anything on the phone side.

Or skip the choice entirely: WOCOM AI is included with Cloud PBX and already tuned for Jamaican callers. See the full guide to AI receptionists, or contact WOCOM.