SIP Extension

SIP-to-SIM Technology
Connect Your SIP Trunk

Connect Your SIP Trunk to Mobile

Turn a physical SIM or eSIM into a standards-compliant SIP/VoIP endpoint that registers to your PBX. A SIP-enabled SIM behaves like a desk phone: it receives your business extension, participates in transfers, joins queues and is captured by corporate call recording. This delivers true mobile parity without softphone apps and keeps control inside your telephony estate.

SIP-to-SIM Technology
Why choose SIP-to-SIM?

SIP-to-SIM is ideal where reliable mobile connectivity, centralised controls and international cost predictability matter:

  • Maintain PBX controls — calls continue to pass through your SIP server so logging, recording and compliance remain centralised.
  • Real mobility — users keep office features on the move without relying on Wi‑Fi softphones.
  • Roaming & cost control — centralised roaming packages reduce international termination costs compared with scattered local SIM contracts.
  • Simple provisioning — over-the-air SIM/eSIM provisioning and SIP credential management speed onboarding and offboarding.
Examples — How organisations use SIP-to-SIM
Field Service & Maintenance

Mobile technicians receive calls on their business extension while on-site, keeping call logs and recordings in the central PBX. No personal numbers required; provisioning is handled centrally.

Sales & Travelling Staff

Sales teams keep one office number when abroad. Dyonix roaming rates reduce international call costs while preserving PBX features and CRM integration.

Education & Campus Operations

Reception and campus teams use SIP-enabled SIMs to stay reachable across buildings without exposing personal mobiles.

Multi-site Retail & Local Presence

Provide local mobile presence for branches using centralised SIP trunking with SIM termination, lowering termination costs and simplifying management across multiple stores.

Real Cellular Voice Quality

Our solution uses genuine mobile network infrastructure to deliver crystal-clear voice calls. No battery-draining softphone apps – just native cellular functionality that integrates seamlessly with any SIP-compliant phone system.

VoLTE Technology

Native 4G/5G voice over LTE with automatic fallback to 2G/3G networks for maximum reliability and coverage.

Universal Compatibility

Works with any mobile phone via a physical SIM or eSIM for maximum flexibility.

Roaming Coverage

Seamless roaming across EU/EEA countries plus additional regions including UK, USA and Switzerland, with native cellular quality.

Security First

Full TLS & SRTP encryption support with GDPR-compliant infrastructure and optional end-to-end encryption.

Current Home Countries (Card Issuance)

Cards can currently be issued as a home location in the following countries:

  • Austria
  • Belgium
  • Denmark
  • France
  • Germany
  • Ireland
  • Isle of Man
  • Italy
  • Luxembourg
  • Mexico
  • Netherlands
  • Poland
  • Spain
  • Sweden
  • Switzerland
  • United Kingdom
  • United States

Hover over countries to view availability state. Home countries also show network partner and service capabilities.

Home Country (green), Home Away Country (navy), Day Pass Allowed (teal), Day Pass Non-Supported (gray).

Ready to Extend Your SIP Trunk?
Connect your business phone system to mobile devices seamlessly
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How It Works

Our SIP-to-SIM technology creates a direct bridge between your SIP trunk and cellular networks. Simply provision your SIP credentials through our secure portal, and the SIM automatically connects to your phone system over-the-air.

Instant Configuration

Enter your SIP trunk details in our portal – SIP host, username, and password. Changes take effect immediately via over-the-air updates.

Native Integration

Your smartphone becomes a true SIP extension with full caller ID, call pickup, and feature access.

Mobile SIP Integration
Physical & eSIM Options

Available as traditional SIM cards or modern eSIM profiles. Perfect for dual-SIM smartphones and IoT devices.

Enterprise Ready

GDPR compliant with EU-based infrastructure. EN 301 489 & CE certified for enterprise deployment.

Technical Capabilities
  • Direct SIP server registration from SIM
  • Native cellular voice without softphone apps
  • Full caller ID presentation and call pickup
  • TLS & SRTP encryption support
  • Over-the-air configuration updates
  • Emergency 112 routing across EU
Compatible SIP Platforms

Our SIP-to-SIM technology works with any standards-compliant SIP trunk, SIP server, or VoIP platform, ensuring broad compatibility for your business communications.

  • SIP trunk providers
  • SIP servers and registrars
  • VoIP service platforms
  • Cloud-based SIP solutions
  • On-premise SIP installations
  • All standards-compliant SIP systems

Technical Questions

Common questions about SIP-to-SIM integration and compatibility

After ordering, you receive secure portal access to enter your SIP server details: host address, username, and password. The SIM profile downloads these settings over-the-air within seconds.

Our SIP-to-SIM works with any standards-compliant SIP trunk, SIP server, or VoIP platform. Full TLS & SRTP security protocols are supported.

Our SIP-to-SIM solution provides a dedicated mobile connection for your SIP infrastructure. It can be used alongside your existing mobile number in dual-SIM devices or as a dedicated business line.

All SIMs include full 112 emergency service routing across every EU member state. The solution is EN 301 489 & CE certified for enterprise deployment.

Yes, our SIM core and data infrastructure are located within the European Union. All call detail records and optional recordings are stored in GDPR-compliant data centers with enterprise-grade security.

Ready to Connect?

Transform Your SIP Trunk Mobility

Discover how Dyonix SIP-to-SIM technology can seamlessly extend your business phone system to mobile devices across Europe, UK, USA and Switzerland.

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