Connect your existing PBX without replacing it
Keep your PBX. Keep your numbers. Upgrade everything else.
How does PBX connectivity work?
SBT Networks connects your phone system to a modern voice network using SIP.
This allows you to improve call quality, reliability, and flexibility without changing your internal system.
What you get
SIP connectivity
Standards-based SIP trunking that connects your PBX to our voice network.
No hardware replacement
Keep your existing phones, switches, and infrastructure in place.
Keep existing numbers
Port your current phone numbers with no disruption to service.
Flexible routing
Policy-based call routing with failover and geographic preferences.
Supported systems
- FreePBX deployments
- 3CX systems
- Asterisk environments
- Microsoft Teams Direct Routing
- Other SIP-compatible platforms
- Hybrid cloud + on-prem environments
Ready to connect your phone system?
Keep your PBX. Upgrade your voice. Talk to us about getting connected.
Frequently asked questions
Do I need new hardware?
No. SBT Networks connects to your existing PBX using SIP. Your current phones and infrastructure stay in place.
Can I keep my current provider?
Yes. You can run SBT Networks alongside your current provider or migrate fully — your choice.
How is this different from SIP trunking?
It is SIP trunking — but positioned as a connectivity service. You get the same SIP connectivity with better support, routing control, and integration.
Does it support hybrid environments?
Yes. SBT Networks supports cloud, on-premises, and hybrid deployments across multiple sites.