What should I use to build a phone menu and call transfers?

If you want to build a phone menu (IVR) and call transfers, the best tool depends on whether you want to do it quickly or customize it heavily.

Good options

1. Twilio Programmable Voice

Best for most custom phone systems.

• Build IVR menus like “Press 1 for sales, 2 for support”
• Transfer calls to people, SIP endpoints, or other numbers
• Easy to integrate with your app/backend
• Supports call recording, voicemail, status callbacks, etc.

Use this if you want:

• A cloud API
• Fast development
• Flexible call routing

2. Asterisk / FreePBX

Best if you want full control and run your own phone system.

• Very powerful for IVR and transfers
• Can be self-hosted
• More setup and maintenance

Use this if you want:

• On-prem or self-hosted PBX
• Deep telephony control
• Lower per-call vendor dependence

3. Amazon Connect

Best for contact center style phone menus.

• IVR, queues, transfers, agents
• Built-in reporting and call flows
• Less code than Twilio for some use cases

Use this if you want:

• A contact center
• Built-in call routing/queueing
• AWS integration

4. Vonage Voice API / Plivo

Similar to Twilio

• Voice menus and transfers
• API-driven phone control
• Good alternatives if pricing or features fit better

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Simple recommendation

• For building an app-based phone menu: use Twilio
• For a full PBX you host yourself: use Asterisk/FreePBX
• For a contact center: use Amazon Connect

If you want, I can also give you:

1. a recommended architecture, or
2. a sample Twilio IVR flow with call transfer code.