Running a business in Houston is expensive enough without overpaying for a phone system that was designed in the 1990s. Yet thousands of small and mid-sized companies across Houston, Cypress, Katy, and The Woodlands are still paying for legacy PBX hardware, per-line licensing, and maintenance contracts that deliver far less than modern alternatives.

This post breaks down exactly where the money goes in a traditional PBX setup, what 3CX costs by comparison, and how a realistic 10-seat office in the Houston area could cut its monthly phone spend by half or more.

The Real Cost of a Legacy PBX System

Most business owners know their monthly phone bill, but the full cost of a legacy PBX is spread across several line items that are easy to overlook.

Hardware and Maintenance

Traditional PBX systems require physical hardware — a main control unit, line cards, desk phones, and often a dedicated server cabinet. Initial installation for a 10-seat office can run between $8,000 and $15,000. That hardware depreciates, breaks down, and eventually becomes obsolete, requiring expensive vendor support contracts or full replacement every five to seven years.

Per-Line PSTN Charges

Legacy systems typically use ISDN PRI or analog POTS lines. Each concurrent call path costs money. A 10-seat office usually needs at least 8 to 10 concurrent call paths. At $35 to $50 per line per month from a regional carrier, that is $280 to $500 per month before a single call is made.

Hidden Fees That Add Up

Beyond the line charges, legacy systems often carry:

Monthly maintenance contracts: $100 to $300 per month
Per-feature licensing for voicemail, auto-attendant, or call recording: $20 to $75 per feature per month
Moves, adds, and changes billed at hourly rates by the vendor: $150 to $250 per hour
Long-distance and international call markup from the carrier

When you total these up honestly, a 10-seat legacy PBX office in Houston is often spending $900 to $1,400 per month on phone services alone.

How 3CX Changes the Math

3CX is a software-based phone system that runs on standard hardware, a cloud server, or a hosted instance. It replaces proprietary PBX hardware with a licensing model that is priced per simultaneous call rather than per user, which is a fundamentally different — and cheaper — structure for most businesses.

3CX Licensing Costs

3CX licenses are based on the number of simultaneous calls, not the number of extensions. A 10-seat office rarely needs more than 4 to 6 simultaneous calls. The 3CX SMB license for 8 simultaneous calls runs approximately $175 per year, which works out to about $15 per month. Enterprise features including call recording, wallboards, CRM integration, and live chat are included at no additional charge.

SIP Trunking: Where the Real Savings Come In

Instead of paying for PSTN lines, 3CX connects through SIP trunks — VoIP-based call paths purchased from a SIP provider. For a 10-seat Houston office, 8 concurrent SIP channels typically cost $40 to $80 per month depending on the provider and included minutes. That is a reduction of $200 to $400 per month compared to traditional ISDN or analog lines.

A Realistic 10-Seat Cost Comparison

Cost Category	Legacy PBX (Monthly)	3CX (Monthly)
Line/trunk charges	$400	$60
Licensing/software	$100	$15
Maintenance contract	$200	$0
Feature add-ons	$75	$0
Hardware amortization	$150	$20
Total Estimated	$925	$95

This is a conservative comparison. Actual savings vary based on your current carrier contract, call volume, and whether you choose hosted or self-hosted 3CX.

Hosted vs. Self-Hosted: Which Option Fits Your Business

Hosted 3CX

Houston TechSys manages the 3CX server in the cloud on your behalf. You pay a flat monthly fee that covers hosting, updates, backups, and support. This is the right choice for businesses without in-house IT staff. Setup is faster and there is no server to maintain.

Self-Hosted 3CX

3CX can also be installed on a server you own or an existing cloud VM. This option is typically chosen by businesses with IT resources who want full control over their phone system infrastructure. The upfront cost is higher, but the long-term cost can be lower.

For most small businesses in the Houston area, hosted 3CX is the simpler and more cost-effective path.

What to Expect During Migration

A properly planned migration from legacy PBX to 3CX does not disrupt your business. The process generally takes one to three days depending on the size of your office. Your phone numbers are ported to the new SIP provider, extensions are configured, and desk phones are either replaced with 3CX-compatible IP phones or replaced entirely with softphones on computers and mobile devices.

Staff training on 3CX typically takes less than an hour. The interface is straightforward, and most employees are comfortable with it by their second day.

Ready to See What You Would Actually Save

If your Houston-area business is still running a legacy PBX, the cost difference is real and measurable. Houston TechSys offers a free phone system review for businesses in Houston, Cypress, Katy, and The Woodlands. We will look at your current setup, identify where the money is going, and show you a specific cost comparison for 3CX.

Call us at (346) 254-1234 or email [email protected] to schedule your review.

How to Cut Your Business Phone Bill in Half: Moving from Legacy PBX to 3CX in Houston