Analog to VoIP upgrades across Houston: towers, clinics, warehouses and home offices

Why Houston offices are being moved off copper, planned or not

Most businesses do not choose to leave analog lines; they get pushed. Carriers have been retiring copper and raising prices on the business lines that remain, AT&T has said publicly that it plans to exit most of its copper network by the end of this decade, and repairs on aging underground cable in a flood-prone city can drag on for days.

Meanwhile the key systems many Houston offices still run — Avaya Partner, Nortel Norstar, older Panasonic and Toshiba cabinets — have been out of production for years, so a failed card means hunting for used parts. The upgrade replaces the phone company’s line, and usually the phone system with it, by carrying calls over your internet connection to a hosted phone service. Done well, it brings ring groups that include cell phones, an auto attendant and voicemail delivered to email. Done carelessly, it strands the fax machine, silences the alarm communicator and leaves the elevator phone dialing nowhere.

EVOTECH is not the phone carrier. We prepare the building and network, install and program the phones, and coordinate the number port with whichever provider you choose — or help you compare providers on the points that actually matter if you have not picked one.

Six Houston building types, six different upgrade plans

The copper audit: find every job a line is doing before anyone cancels it

The costliest mistake in a migration is canceling a line whose purpose nobody remembered. Before designing anything we get the customer service record (CSR) from your current carrier — its own list of every number, feature and circuit on the account — then trace each pair in the building to whatever it feeds. Lines that routinely turn up unlisted:

• Fire alarm communicators. Commercial fire panels have traditionally reported over two phone lines. Replacing that path, typically with a cellular or IP communicator, belongs to your licensed fire alarm company; we coordinate timing with them and never touch the panel.
• Elevator emergency phones. The cab must keep a working two-way emergency connection, so the replacement is arranged with your elevator service company before the copper goes.
• Burglar alarm dialers, which report as tones that compressed voice paths can garble.
• Card terminals and postage meters with a dial-up fallback.
• Gate, parking and dock intercoms that call a number when someone presses the button.
• DSL riding on a voice line. Port that number away and the internet on it dies too.
• Numbers with no phone at all — a remote call-forward, a distinctive-ring fax number, an 800-series number pointed at the main line.

Each one gets a decision: move it to VoIP through an analog telephone adapter (ATA), move it to cellular, or retire it on purpose.

Office towers: the demarc, the riser and the paperwork

In a high-rise your suite does not own the path to the street. The carrier hands off service in the building’s main telecom room, the riser between floors belongs to the landlord, and the building engineer decides who opens which closet, and when. In practice:

• Most property managers require a certificate of insurance naming them before a contractor is badged in. We send ours ahead so the visit is not lost at the loading dock.
• Drilling, ceiling work and anything in a shared corridor is usually limited to evenings or weekends, and freight elevator time is booked in advance.
• If your internet already arrives over fiber the building serves, the upgrade may need no riser work. If it still rides copper down to the basement, the new circuit’s install date is scheduled before the port date, never after.
• Suite cabling is often Cat5e or Cat6 left by a previous tenant. We certify it rather than assume it.

Warehouses and yards: distance, noise and heat

• Distance. An Ethernet channel tops out at 100 meters (328 feet), patch cords included. A phone at the far dock of a large building needs fiber to a small switch nearby — not an overlong copper run that works on day one and throws errors in August.
• Heat. Switches and UPS batteries in an unconditioned mezzanine age quickly through a Houston summer. We specify hardware rated for it or move it into conditioned space.
• Paging. Overhead paging amplifiers that hung off a port on the old system need a SIP paging adapter or zone controller, and the page groups are rebuilt in the new platform.
• Noise and movement. Loud floors get external ringers or strobe lights. Staff who roam get DECT cordless IP handsets, which hold up better around steel racking than Wi-Fi phones.

When CenterPoint drops the power, what should still ring?

An analog line drew its power from the phone company, so a basic desk phone kept working through a blackout. VoIP does not. After the long regional outages of 2024, most Houston owners we speak with want a clear answer about what happens when the lights go out. Our standard design covers four things:

1. A UPS on the fiber terminal or modem, the firewall and the PoE switch, sized from the measured load. Desk phones draw only a few watts apiece, so a properly sized unit can carry a small office for a useful stretch.
2. A cellular backup internet link on the firewall for sites that cannot tolerate downtime, with voice allowed to fail over to it.
3. Failover routing at the provider, so that if the office stops answering, calls go to mobile apps or cell numbers instead of ringing into silence.
4. Written staff instructions for calling 911 when the building itself is offline.

911 on a multi-line system: the federal rules we design around

Businesses with multi-line phone systems fall under Kari’s Law and the dispatchable-location rules that followed the RAY BAUM’S Act. In plain terms: anyone must be able to dial 911 directly, without a prefix such as 9; the system must alert a central point, like a front desk or security office, when a 911 call is placed; and the call must carry a location precise enough for responders to find the caller. In a tower, that means floor and suite, not just a street address. We register each location with the provider, set up the notification, and verify the address on file for any phone that moves between floors or buildings.

How a Houston cutover runs, stage by stage

1. Survey. CSR, copper audit, and a network test for jitter, packet loss and upload capacity during your busiest hour.
2. Design. A voice VLAN, QoS marking (EF for voice, CS3 for signaling), SIP ALG turned off on the firewall, and a PoE budget checked against every handset.
3. Porting paperwork. A letter of authorization signed exactly as the account appears on the carrier bill. The new provider then receives a firm order commitment (FOC) date; simple ports often take days, while large multi-line accounts can take several weeks.
4. Pre-staging. Phones programmed, labeled by desk, and tested on temporary numbers before port day.
5. Port day. We cover the carrier’s activation window, place inbound test calls from several carriers and cell phones, and confirm outbound caller ID, fax and every ATA.
6. Close-out. Only after every number is confirmed do we tell you to cancel remaining copper, so the old carrier cannot disconnect a number mid-port.

What drives the size of a Houston upgrade

Whole-office migrations are priced itemized after a walk-through, never over the phone. The variables: how many phones and what kind (basic, executive, cordless, conference); whether existing cabling passes testing; building access rules and after-hours requirements; how many analog devices need adapters or cellular replacements; paging and intercom integration; UPS and backup internet; how complex the call flow is (departments, hours, languages); and whether more than one site is involved.

Four migration failures we get called in to fix

• One-way audio, or calls that drop after about 30 seconds. Nearly always a firewall’s SIP ALG rewriting packets or a NAT timeout discarding the call’s acknowledgment.
• Calls that drop at exactly 15 or 30 minutes. A session-timer mismatch between the phones and the provider.
• Faxes that fail partway through. Plain G.711 passthrough over a jittery link; T.38 on the adapter or an online fax service usually cures it.
• An alarm that stopped reporting months ago. The dialer was moved to VoIP untested, and nobody noticed until an inspection or a real event.

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