Business Phone Systems
SIP Trunking for the Phone System You Already Own
SIP trunking replaces the phone lines behind your business phone system, not the system itself. If you run a modern PBX, Telnamix moves your calls onto internet-delivered trunks that cost less, scale with your call volume, and keep your numbers and handsets exactly where they are.
What is SIP Trunking?
Your Phone Lines, Delivered Over the Internet
SIP (Session Initiation Protocol) trunking replaces traditional phone lines with virtual ones delivered over your internet connection. Instead of leasing physical PRI circuits with fixed capacity, your phone system connects to the telephone network through SIP "trunks" that carry calls as data: the same calls and the same phone numbers, without the cost and rigidity of legacy lines.
Because SIP trunking connects to the PBX you already own, it is usually the fastest way to modernize business communications: no forklift upgrade, no retraining, no new handsets. You add or remove call capacity as your needs change, multiple locations can share the same trunks, and calls reroute automatically if your internet or site goes down. That is why growing and multi-location businesses make the switch.
Sound Familiar?
When the Phone Lines Cost More Than the Phone System
Businesses usually come to us about SIP trunking because of a bill. A PRI circuit is sold in fixed blocks of call capacity, so an office that needs twelve lines pays for twenty-three, and adding a thirteenth caller at the busiest hour means ordering another circuit. The phone system itself is often fine. It is the copper behind it that has become the expensive part.
The other common trigger is growth. A second office wants to share the first one's numbers, a seasonal rush needs more capacity for three months, or the local carrier has announced it is retiring the copper lines altogether. SIP trunking handles all of these without touching the system your staff already knows how to use. If your PBX is aging rather than just expensive to connect, a hosted business phone system may be the better move, and we will tell you so.
Core Benefits
Save Money, Stay Connected, and Improve Communication
Lower Monthly Costs
Eliminate expensive PRI lines and pay only for the capacity you need.
High-Quality Voice Calls
Modern VoIP technology ensures clear, reliable communication.
Scalability
Easily adjust call paths as your business needs change.
Built-In Disaster Recovery
Automatic call rerouting keeps you reachable during outages.
Multi-Site Compliant E911
Advanced 911 features for multi-location operations.
Flexible Integration
Seamless connection with your existing systems and tools.
How It Works
How We Move Your Phone System to SIP Trunks
Step 1
Assess the PBX and network
We confirm your phone system can register SIP trunks and that your internet connection carries clean voice, before anything is ordered.
Step 2
Size the trunks
Capacity comes from your real calling pattern: the most calls your business carries at the same moment, not one line per employee.
Step 3
Port the numbers
We file the porting paperwork with your current carrier and set up E911 addresses for every location your system serves.
Step 4
Cut over on a schedule
The switch happens at a time you choose, and we test calls in and out on every number before we call the job done.
Compatibility
Works with the Hardware You Already Have
Our SIP trunks are compatible with IP-based phone systems from brands like Yealink, Cisco, Avaya, and 3CX, with no expensive upgrades required. You also get web-based management, unified communications (call, text, video), secure remote work, and web chat with Facebook Messenger integration.
Why Choose Telnamix
Transparent Pricing, Responsive Support
SIP trunking is only as good as the carrier behind it. Telnamix runs its own platform and carrier services, so when you call support you reach U.S.-based engineers who can see your trunks end to end, not a reseller relaying tickets to a vendor. Questions get answered by people who administer SIP trunks every day.
Pricing follows the same common-sense approach as the rest of our services: you pay for the call capacity you actually use, with no hidden fees and no long-term contracts. And the implementation is a proven process, not an experiment. We assess your PBX and network first, handle the number-porting paperwork for you, and schedule the cutover so your business never misses a call.
Transparent Pricing
Capacity-based pricing with no hidden fees or long-term contracts. Pay for the simultaneous calls your business actually carries.
Responsive U.S.-Based Support
Real engineers answer your questions and can see your service end to end, from the trunk to the handset.
Proven Implementation Process
Network assessment, number porting with the paperwork handled, and a scheduled cutover with minimal disruption.
Proof
SIP Trunks from a Carrier That Also Runs Phone Systems
Telnamix has been in business phone systems since 2017, with roots going back to 2013. Hundreds of companies run their phones with us, and our 3CX practice alone spans 16 states and thousands of extensions. That matters for SIP trunking, because most trunk problems show up inside the phone system: one-way audio, calls that drop at a fixed time, caller ID that arrives wrong. Our engineers administer phone systems every day, so they recognize those problems on sight instead of blaming the other side.
For the background, read SIP Trunking 101, our plain-language guide, and our explanation of Kari’s Law and RAY BAUM’S Act if your business has more than one location. To compare trunks with the other ways to run your phones, see our business phone systems overview.
FAQ
SIP Trunking Questions
If your PBX is IP-based, almost certainly. Our SIP trunks work with systems from Yealink, Cisco, Avaya, and 3CX, among others, without replacing the system or the handsets. If yours predates IP, we will tell you during the assessment whether connecting it still makes sense or whether moving to a hosted system costs less.
Keep your phones. Lower your bill.
Find the perfect fit for your business, backed by our expertise and support. We’ll match the right solution to your needs.