Next-Gen SIP / WebRTC
Hybrid Calling Platform
From app-to-app calls to PBX and PSTN. Automatically selects the optimal protocol to provide an ultra-clear, seamless calling experience.
Key Features of Tsuwa
Hybrid Smart Routing
Prioritizes P2P WebRTC for 1-on-1 calls. Automatically connects to SIP extensions and PSTN gateways without requiring manual protocol switching.
Group Calls & Voice Rooms
Powered by Anycast edge-managed SFU (Cloudflare Calls). Experience crystal-clear, low-latency group voice and video communication.
Multi-Platform Support
Unified calling experience across iOS (SwiftUI), Android (Jetpack Compose), and modern Web browsers with shared core logic.
Flexible Communications Architecture
WebRTC + SFU / TURN
Utilizes Opus, Google Lyra v2, and AV1 codecs for internal and group calls, optimizing bandwidth constraints while maintaining high fidelity. High reliability NAT traversal with coturn and resilient media relay via SFU.
SIP (Kamailio / BYOA)
Integrates with user-owned SIP servers (Bring Your Own Account) and Kamailio. Reliable incoming call delivery via tsilo and native Apple Push Notifications (APNs).