Voice Proxy

Voice Proxy is the technique used to protect users' private information by providing an intermediary number so that neither sender nor receiver can see the other's true phone number during voice calls or SMS exchanges.

Voice Proxy is also known as Masked Calling. It is the technique used to protect users' private information by providing an intermediary number so that neither sender nor receiver can see the other's true phone number during voice calls or SMS exchanges.

Voice Proxy is especially useful for scenarios where you want to track or control the transaction between two users, for example in a marketplace. Examples of peer-to-peer marketplaces that use Twilio as a Voice Proxy are Uber, Lyft, Airbnb, Postmates, and Instacart.

There are two key ways to build a Voice Proxy system:

• Build a custom Voice Proxy using the Twilio SMS and Voice APIs.
• Use a pre-built API, such as Twilio Proxy, that manages the sessions and number pooling for you.

More resources

• Read how Uber uses Twilio for Voice Proxy.
• Learn why you might want to use Voice Proxy.
• See the basic steps to build a Voice Proxy.
• Run this code tutorial on building Voice Proxy with C#.