Carrier-Grade Voice for Any PBX
Already have a PBX you love? Don't replace it — upgrade its connectivity. IntelliVoice SIP Trunking delivers enterprise-grade PSTN connectivity to your existing phone system, whether it's on-premise or in the cloud.
Our network spans three geo-redundant datacenters with automatic failover. If one path goes down, your calls route through another — seamlessly and instantly.
Works With Your Existing PBX
FreePBX, PBXact, and custom Asterisk builds
On-premise and cloud-hosted 3CX systems
CUCM, CME, and Webex Calling
Avaya, Mitel, Grandstream, and more
Technical Specifications
| Feature | Specification |
|---|---|
| Codecs Supported | G.711u, G.711a, G.729, Opus |
| Signaling | SIP over UDP/TCP/TLS |
| Media | RTP/SRTP |
| DTMF | RFC 2833, SIP INFO, In-band |
| Fax Support | T.38, G.711 passthrough |
| Max Concurrent Calls | Unlimited (per account) |
Why Choose Our SIP Trunks?
Multi-Carrier Network
We're not a single-carrier reseller. Our network aggregates multiple Tier-1 carriers for redundancy and quality.
Expert Support
Our team has configured thousands of SIP trunks. We'll help you get connected — even with tricky firewall setups.