Halcyon
Halcyon: A capable free Android SIP client for multiple accounts and self-hosted deployments. Ranked #20 of 33 in Softphone Software by our editors (6.5/10); pricing: Free plan; best for free Android softphone with self-hosting options.
At a glance
- Editor score6.5 / 10
- PricingFree plan
- Best forFree Android softphone with self-hosting options
- Free planYes
- Paid fromFree
- Mobile appYes
- Facts checked23 Sep 2026
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
Our verdict on Halcyon
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.
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Halcyon pricing
Halcyon fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Browser calling | No |
| Mobile app | Yes |
| Desktop app | No |
| Call recording | Not verified |
| Business SMS | Not verified |
| SIP support | Yes |
| Deployment | Mobile |
| Platforms | Android |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 3 integrations: PJSIP, Firebase Cloud Messaging, Android Telecom |
| Pricing | Free plan |
| Website | halcyon.tel |
| Facts checked | 23 Sep 2026 |
Halcyon integrations
Halcyon lists 3 integrations on its own site.
- PJSIP
- Firebase Cloud Messaging
- Android Telecom
Alternatives to Halcyon
- LinphoneA versatile free softphone for SIP calling across desktop, mobile, and web platforms.9.1
- ZoiperA broad, SIP-focused softphone with strong platform coverage and flexible licensing.8.8
- PhonerLiteA Windows-only SIP softphone with recording, encryption, scripting, and Whisper transcription.8.3
See all Halcyon alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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