Software Session Border Controller
for Modern Voice Networks
Designed for ISPs, MSPs, and contact centers that need simple, reliable, and scalable voice infrastructure.
ProSBC + AI
Turn any LLM into a ProSBC expert
The TelcoBridges MCP exposes ProSBC’s full configuration surface to any MCP-compatible LLM. Ask questions, sure. But also make the change, push the route, upload the license. All in natural language, all with your explicit approval, all audit-logged.
Manage ProSBC workflows in natural language
Make configuration, routing, licensing, and troubleshooting easier to handle from the tools your team already uses. ProSBC keeps the control where it belongs while reducing the effort needed to get everyday work done.
- Make config changes in natural language
- Full ProSBC documentation queryable in any language
- License management: check expiry across your fleet, upload renewals
- Works with Claude Desktop, Cursor, Continue, Cline, OpenCode, or any MCP client
- Every write action stays under your approval
Free to use. No subscription. No credit card. Bring whatever LLM you already pay for.
Configuring now.
{"name":"twilio","host":"sip.twilio.com","port":5061,"transport":"TLS"}
{"primary":"twilio","failover":"twilio-west"}
Twilio added on TLS 5061. Failover to twilio-west is live. No restart required.
Pulling SIP ladders for that window.
{"nap":"verizon","window":"14:25-14:35"}
{"call_ids":["a3f2","a3f7","a402"]}
All three failed at INVITE with 488 Not Acceptable Here. Verizon offered G.722 but our routing forced G.711. Recommended fix: enable codec transcoding on the Verizon NAP. Want me to apply it?
Managed Service
We make voice networks easy
You keep your customers, your carrier contracts, your routing logic, and your data. We handle the SBC layer underneath, giving you the voice infrastructure you need without adding the operational burden to your team.
We have been working in VoIP since the beginning. Our team brings over 100 years of combined experience across SS7, SIP, hardware gateways, and cloud-native deployments. With ProSBC Managed Service, that expertise is with you 24×7.
Why a session border controller, why now
If this sounds familiar, ProSBC was built for you
Most ProSBC customers find us because something stopped working, or is about to. These are the six triggers we hear most.
Your softswitch or PBX (NetSapiens, FreePBX, Kamailio, FreeSWITCH) is being stretched to do security, routing flexibility, and number portability tricks it was never designed for. It works. It is also fragile, and the next person to touch it will not understand it.
There is a lot of SBC-related functionality we want to have, as opposed to the hacky SaaS method we are currently using.
When a software outage is your outage, it is not a good day. When the vendor is six time zones away and the bug has appeared in two consecutive releases, it is a worse one. You need stability, and you need a support team awake when you are.
When your outage is software and preventable, it is not a good day. We want infrastructure we can deploy and not have to make a topic of executive conversation.
Open-source softswitches are wonderful until the network is in production and you are the one paged at three in the morning because a script broke. ProSBC absorbs that role with a carrier-grade session border controller, while keeping the API and MCP server for the customizations you actually want.
I have been working with Kamailio and OpenSIPS for a while and I got tired of writing the scripts and figuring stuff out. I do not have the gusto to do this late at night anymore.
New FCC rules, certificate requirements, signing services, attestation policy. If you are a small or mid-size carrier, MSP, or ILEC, you need this built into the session border controller with an open signing-service partner model, not bolted on after the fact.
As a small company, we are trying to navigate STIR/SHAKEN, FCC registration, and certificate requirements. We needed a vendor that already has this figured out.
You asked for a bug fix, a SIP header behavior change, or a small feature improvement. The answer came back: “It is not on our roadmap. The codebase is too legacy to modify.” If your session border controller came from a company that grew by acquisition, that is what years of unaddressed tech debt look like from the customer side, and there is no version of the next quarter that fixes it.
We have asked them three separate times. The answer is the same every time: ‘It is not possible in our codebase.’ We are paying a lot for software that cannot be touched.
Per-minute pricing scales linearly with traffic. Session-based pricing on your own SBC scales with capacity. Once you are past a few hundred concurrent calls or a few million minutes a month, the math has already flipped. Owning your voice infrastructure pays back fast.
We have been using Twilio since 2014, but they have just become very expensive. It is all the add-ons. In a world of AI where you can build stuff so much faster, we would not be thinking about doing this pre-AI.
Your softswitch or PBX (NetSapiens, FreePBX, Kamailio, FreeSWITCH) is being stretched to do security, routing flexibility, and number portability tricks it was never designed for. It works. It is also fragile, and the next person to touch it will not understand it.
There is a lot of SBC-related functionality we want to have, as opposed to the hacky SaaS method we are currently using.
When a software outage is your outage, it is not a good day. When the vendor is six time zones away and the bug has appeared in two consecutive releases, it is a worse one. You need stability, and you need a support team awake when you are.
When your outage is software and preventable, it is not a good day. We want infrastructure we can deploy and not have to make a topic of executive conversation.
Open-source softswitches are wonderful until the network is in production and you are the one paged at three in the morning because a script broke. ProSBC absorbs that role with a carrier-grade session border controller, while keeping the API and MCP server for the customizations you actually want.
I have been working with Kamailio and OpenSIPS for a while and I got tired of writing the scripts and figuring stuff out. I do not have the gusto to do this late at night anymore.
New FCC rules, certificate requirements, signing services, attestation policy. If you are a small or mid-size carrier, MSP, or ILEC, you need this built into the session border controller with an open signing-service partner model, not bolted on after the fact.
As a small company, we are trying to navigate STIR/SHAKEN, FCC registration, and certificate requirements. We needed a vendor that already has this figured out.
You asked for a bug fix, a SIP header behavior change, or a small feature improvement. The answer came back: \“It is not on our roadmap. The codebase is too legacy to modify.\” If your session border controller came from a company that grew by acquisition, that is what years of unaddressed tech debt look like from the customer side, and there is no version of the next quarter that fixes it.
We have asked them three separate times. The answer is the same every time: ‘It is not possible in our codebase.’ We are paying a lot for software that cannot be touched.
Per-minute pricing scales linearly with traffic. Session-based pricing on your own SBC scales with capacity. Once you are past a few hundred concurrent calls or a few million minutes a month, the math has already flipped. Owning your voice infrastructure pays back fast.
We have been using Twilio since 2014, but they have just become very expensive. It is all the add-ons. In a world of AI where you can build stuff so much faster, we would not be thinking about doing this pre-AI.
ProSBC Capabilities
This is why features matter
Session border controller features translate to benefits for your voice network.
Real-time detection and blocking of toll fraud, SIP flooding, and registration attacks at the border.
Connect Teams to any PSTN carrier. No dedicated hardware required. Add-on pricing at $0.75/session/yr.
Caller ID authentication at the border via integrated signing services (TransNexus, Neustar, and others). Sign outbound calls and verify inbound with an open partner model.
Active/standby failover across geographic nodes with automatic traffic rerouting on failure.
Convert between codecs at the network border with dedicated DSP hardware for multi-codec environments where carriers and endpoints don’t speak the same language.
Connect to multiple carriers simultaneously with intelligent routing and automatic failover.
Everything the incumbents can do, at a fraction of the price
ProSBC matches AudioCodes, Ribbon, and Oracle on uptime, scale, and security. What it drops: hardware lead times, opaque pricing, and tiered support walls.
Customer Stories
Built for networks that require 99.999% reliability
From multi-region carrier deployments to contact center platforms, ProSBC runs in environments where reliability is a contractual obligation, not a marketing claim.
Call Rate Management with ProSBC at Vivaro
Vivaro needed granular call rate management and real-time routing control across multiple carrier trunks, without a complex custom integration layer.
Read the story
Paratus Builds a Multi-Region Voice Network Across Africa
Pan-African carrier Paratus needed to interconnect multiple country networks with a single, unified session border controller platform handling the realities of variable PSTN infrastructure.
Read the story
20+ years building infrastructure carriers rely on
TelcoBridges started as a media gateway company. Our hardware runs in the core networks of carriers across 110+ countries. ProSBC is the same carrier-grade engineering, delivered as software.
When you call our support line, you speak directly to the engineers who wrote the code. Not a Tier 1 script. Not an outsourced call center. The same team that built the product.
TelcoBridges is privately held and profitable. We have operated without external funding for 20+ years. No VC runway pressure, no pivot risk. Your support contract is backed by a team that will be here in year three.
What “Canadian-built” means for your procurement team
What “Canadian-built” means for your procurement team
Explore our learning center
Wondering how STIR/SHAKEN actually works, or what to look for in an SBC? We have deep dives on SIP trunking, VoIP security, carrier routing, and the infrastructure decisions that shape modern voice networks.
Start your lab, or talk to an engineer
Spin up a fully functional ProSBC environment in under 20 minutes. Or book time with our team and we’ll scope the right setup for your network.