Halcyon review
A capable free Android SIP client for multiple accounts and self-hosted deployments.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Halcyon is a free, pre-1.0 Android softphone for SIP calling, aimed at people who want native Android call handling with the option to self-host its architecture. It supports multiple SIP identities, per-call account selection, and SIP registration over UDP, TCP, or TLS. The app is distributed through signed APK releases while its Play Store listing is pending, making it a fit for Android users comfortable with that distribution model and for teams evaluating a self-hosted deployment.
Its strongest area is Android and SIP integration. Halcyon uses the PJSIP and pjsua2 SIP/media stack, Android Telecom ConnectionService, and Firebase Cloud Messaging for call-aware push notifications without maintaining a persistent registration connection. Default-dialer support covers tel: and sip: intents, while Bluetooth and Android Auto provide additional audio-routing options. Audio and video codec support, SRTP encryption, and AEC3 echo cancellation give the calling feature set useful technical depth for a free client.
The published Free plan allows installation and use during pre-1.0 development. That keeps the entry point straightforward, but the product remains in active development, and version 1.0 pricing and licensing are planned for announcement before launch. Halcyon should appeal to Android SIP users who value multiple accounts, push calling, native Telecom behavior, and self-hosting. It is less suitable for organizations that require a desktop or browser softphone, or for buyers seeking a mature release with a settled commercial model.
Halcyon pros and cons
- Where it wins
- Supports multiple SIP accounts with per-call account selection
- Offers UDP, TCP, and TLS SIP registration with SRTP encryption
- Adds Android Telecom, Bluetooth, Android Auto, and push-call support
- Where it doesn't
- Still in active pre-1.0 development
- Desktop and browser support are outside its stated support surface
- The Play Store listing is pending
Halcyon fact sheet, pricing and score →
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update