Softphone SDK: Embed carrier-grade calling in your own app
SIP stack, push, codecs, NAT traversal, encryption: all already built. Plug in the pieces you need, design your own experience, and ship under your name.
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Softphone SDK: Embed carrier-grade calling in your own app
SIP stack, push, codecs, NAT traversal, encryption: all already built. Plug in the pieces you need, design your own experience, and ship under your name.
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Works with the SIP core you already run, no lock-in, no hacks
Stop paying per-seat app fees or wrestling with "white-label" solutions that never quite fit. Our SDK gives you raw access to codecs, call flows, and UI—so you ship a product that's yours, not a reskin.
- Certified with major hosted PBX platforms like Metaswitch, BroadSoft, FreeSWITCH, Ooma, and more
- Multi-transport support: TCP, UDP, TLS, SRTP for flexible, secure connectivity
- Built-in BLF, presence, and SMS support (where carrier-supported)
- Proven NAT traversal and SBC/firewall-friendly architecture
Grow, migrate, or scale your backend—the app adapts without a full rewrite.
Works with the SIP core you already run, no lock-in, no hacks
Stop paying per-seat app fees or wrestling with "white-label" solutions that never quite fit. Our SDK gives you raw access to codecs, call flows, and UI—so you ship a product that's yours, not a reskin.
- Certified with major hosted PBX platforms like Metaswitch, BroadSoft, FreeSWITCH, Ooma, and more
- Multi-transport support: TCP, UDP, TLS, SRTP for flexible, secure connectivity
- Built-in BLF, presence, and SMS support (where carrier-supported)
- Proven NAT traversal and SBC/firewall-friendly architecture
Grow, migrate, or scale your backend—the app adapts without a full rewrite.
Freedom to switch, reduced dependency
Maintain control if a vendor sunsets or pivots. With Acrobits, your softphone SDK and brand stay yours, no forced migrations, no lost users.
Try & Buy
Freedom to switch, reduced dependency
Maintain control if a vendor sunsets or pivots. With Acrobits, your softphone SDK and brand stay yours, no forced migrations, no lost users.
Try & Buy
Enhance your softphone app with Premium Features
Choose only what you need. Pay as you grow. Expand when you're ready.
140M+
Endpoints live
160M
Interactions/month
99.995%
Push delivery
600+
Apps using our tech
99.995% push-delivery success across 24k Android device models.
600+ apps in 70 countries, including healthcare and government.
Acrobits SDK: modular softphone API for every stack
Facade
Facade
Higher-level API. Pre-built call flows.
Higher-level API over libSoftphone. Pre-built call flows and UI hooks. For teams that want to move fast and customize selectively.
libSoftphone
libSoftphone
Raw SIP engine.
The raw SIP engine. Full control over call state, media, and codec negotiation. For teams that want to own every layer.
Both SDK layers are part of the Acrobits SIP Mobile SDK, integrating with SIPIS for push reliability and call continuity.
iOS and Android libraries
Native SDKs optimized for each platform with full API access and comprehensive documentation.
SIPIS push infrastructure
Reliable push notifications for incoming calls even when the app is in the background or terminated.
Native CallKit / ConnectionService UX
Seamless integration with native phone UI for a professional calling experience.
QR provisioning
Quick account setup with QR code scanning for effortless user onboarding.
Client APIs for rate checks and web callbacks
Real-time rate queries and balance checks directly within your application.
Multi-platform compatibility
Build once, deploy everywhere with support for multiple frameworks and platforms.
Swift/Obj-CKotlin/JavaReact NativeFluttermacOS CatalystWindows MAUIExtensive technical documentation
Comprehensive guides, API references, and code samples to accelerate your development.
Acrobits SDK: modular softphone API for every stack
Facade
Facade
Higher-level API. Pre-built call flows.
Higher-level API over libSoftphone. Pre-built call flows and UI hooks. For teams that want to move fast and customize selectively.
libSoftphone
libSoftphone
Raw SIP engine.
The raw SIP engine. Full control over call state, media, and codec negotiation. For teams that want to own every layer.
Both SDK layers are part of the Acrobits SIP Mobile SDK, integrating with SIPIS for push reliability and call continuity.
iOS and Android libraries
Native Kotlin/Java and Swift/Obj-C libraries. Drop into your existing codebase. No SIP stack to build from scratch.
SIPIS push infrastructure
Best-in-class incoming call reliability - every push, every time.
Native CallKit / ConnectionService UX
System dialer integration (iOS), lock-screen answering, Do Not Disturb handling, Bluetooth handoff, and proper audio routing. Built on CallKit (iOS) and Telecom (Android).
QR provisioning
Onboard users in seconds, no passwords, no typos, just a single scan or magic link.
Client APIs for rate checks and web callbacks
Real-time rate queries, balance checks, and post-call webhooks. Connect your billing or CRM system directly to call events.
Multi-platform compatibility (Windows/macOS parity)
Extend your SIP software to desktop, maintain brand and feature parity across every device.
Swift/Obj-CKotlin/JavaReact NativeFluttermacOS CatalystWindows MAUIExtensive technical documentation
Comprehensive guides, code samples, and provisioning docs to accelerate your team's success.
Security and compliance: enterprise-grade by default
Security controls
TLS for SIP signaling
SRTP media encryption
Optional ZRTP/DTLS for end-to-end
Certificate management
Granular logging scope
Key rotation support
Full control over your data path. TLS for signaling, SRTP for media, optional ZRTP for end-to-end. Compliant with HIPAA, GDPR, and telecom-grade requirements.
- SIP over TLS: encrypted signaling between app and SBC/PBX
- SRTP media: protected audio/video streams
- Policy and cert store: enforce enterprise controls at the core
- Carrier peering: maintain QoS and compliance at the network edge
Security and compliance: enterprise-grade by default
Security controls
TLS for SIP signaling
SRTP media encryption
Optional ZRTP/DTLS for end-to-end
Certificate management
Granular logging scope
Key rotation support
Full control over your data path. TLS for signaling, SRTP for media, optional ZRTP for end-to-end. Compliant with HIPAA, GDPR, and telecom-grade requirements.
- SIP over TLS: encrypted signaling between app and SBC/PBX
- SRTP media: protected audio/video streams
- Policy and cert store: enforce enterprise controls at the core
- Carrier peering: maintain QoS and compliance at the network edge
Security and compliance: enterprise-grade by default
Security controls
TLS for SIP signaling
SRTP media encryption
Optional ZRTP/DTLS for end-to-end
Certificate management
Granular logging scope
Key rotation support
Full control over your data path. TLS for signaling, SRTP for media, optional ZRTP for end-to-end. Compliant with HIPAA, GDPR, and telecom-grade requirements.
- SIP over TLS: encrypted signaling between app and SBC/PBX
- SRTP media: protected audio/video streams
- Policy and cert store: enforce enterprise controls at the core
- Carrier peering: maintain QoS and compliance at the network edge
Business impact: efficiency through capability
Ready to build?
Building with Acrobits SDK means assembling the right team and infrastructure. Most successful integrations share these traits:
Readiness checklist:
- SIP expertise or partnership
- Backend/infrastructure team
- Mobile development capability
- DevOps/release pipeline
- QA for voice & video
- Customer support readiness
Readiness level
The more mobile expertise you have in-house, the faster you go from integration to ship. The SIP hard part is already done.
Business impact: efficiency through capability
Ready to build?
Teams with SIP protocol integration experience can reduce support, automate onboarding, and ship voice innovation faster.
Readiness checklist:
Readiness level
The more mobile expertise you have in-house, the faster you go from integration to ship. The SIP hard part is already done.
Business impact: efficiency through capability
Ready to build?
Teams with SIP protocol integration experience can reduce support, automate onboarding, and ship voice innovation faster.
Readiness checklist:
Readiness level
The more mobile expertise you have in-house, the faster you go from integration to ship. The SIP hard part is already done.
Book a live demo
Bring your stack. We'll walk through how the SDK fits in: architecture review, push setup, provisioning flow, and a clear path to shipping.
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