When your platform creates a session - say, a rider-driver match - your backend sends a single API request containing both real numbers. The provider allocates a virtual proxy number for that session and returns it. Both parties call or receive calls from that proxy. The provider's infrastructure bridges the two call legs in real time, so each party hears a normal phone call but neither ever sees the other's number. When the session window expires, the proxy is released back to the pool.

This is one of the most important things to test in sandbox before going to production. Good providers offer a fallback API endpoint on a separate infrastructure path, plus number pool redundancy across data centres. We check failover behaviour and allocation error rates as part of our vetting process - providers without documented failover mechanisms are not listed here.

Yes. Masked calls still traverse the PSTN and are subject to TRAI's Unsolicited Commercial Communication (UCC) framework where applicable, as well as call recording consent requirements under Indian law. All providers listed here have documented compliance with TRAI regulations and store call data in India under the DPDP Act 2023. We confirm this during vetting — it is a hard requirement, not optional.

Session duration is configurable at the API level — most providers support windows from 15 minutes to 72 hours. For ride-hailing and food delivery, 30 to 60 minutes is typical. For home services or multi-day logistics, longer windows can be set per order type. We flag any provider with minimum session duration limits during the matching process.

All providers listed here deliver call events — initiated, connected, duration, disconnect reason — via webhook to your endpoint in real time. Recordings are available via an authenticated API endpoint within minutes of call completion, with retention periods configurable from 30 days to 7 years depending on your compliance needs. The recording URL and call SID are also included in the webhook payload so your order management system can store the link without polling.