The Future of Communication: Why Philadelphia Businesses Are Upgrading from POTS Callboxes to IP or Cellular-Based Intercom Systems
- Mar 18
- 6 min read
Updated: 3 days ago
Across Philadelphia, property owners and facility managers are facing a quiet but urgent shift in building technology: traditional intercom systems powered by analog telephone lines are rapidly becoming obsolete.
For decades, Plain Old Telephone Service (POTS) callboxes served as dependable communication devices for apartment buildings and office complexes. Many popular telephone entry systems, such as Linear, Quantum, Select Engineering, and Doorking, provided a reliable entry solution for buildings utilizing their POTS line. However, these POTS lines are now being phased out in favor of faster, more flexible digital communication technologies, rendering their callboxes unserviceable or obsolete.
For multi-family buildings, commercial properties, and mixed-use developments, understanding this transition and how it impacts your property is imperative in order to maintain functionality, security, and provide necessary services for your tenants. In this article, we’ll break down why POTS is disappearing, explore modern upgrade options, and help you determine the best path forward for your building.
What is POTS and why is it Being Phased out?
POTS, or Plain Old Telephone Service, refers to the traditional analog phone lines that have been in use for over a century. These copper-based systems were originally designed for voice communication and later adapted to support building intercoms and callboxes. However, several factors are driving their decline.
Telecom Industry Shift to Digital
Major telecom providers are transitioning from analog infrastructure to VoIP (Voice over Internet Protocol) and wireless technologies. Maintaining aging copper networks is costly and inefficient compared to fiber and cellular systems.
Rising Costs
As fewer customers rely on POTS, service providers are increasing rates to offset maintenance costs. Monthly line charges for callboxes have risen significantly in recent years.
Limited Technical Support
Finding technicians who specialize in maintaining and repairing analog systems is becoming increasingly difficult. Replacement parts are also scarce.
Reliability Concerns
Old copper lines are more susceptible to weather damage, signal degradation, and outages, especially in dense urban environments.
Upgrade Options: Cellular vs. IP Intercom Systems
For buildings currently using POTS-based callboxes, upgrading may seem daunting, especially since many older properties lack modern low-voltage wiring to each unit. Fortunately, two technologies stand out as practical and cost-effective alternatives:
Cellular-based intercom systems
IP (Internet Protocol)-based intercom systems
Both options eliminate the need for legacy telephone lines and offer enhanced features, but they differ in capability and complexity.
Cellular Intercom Systems
How They Work
Cellular intercoms use mobile networks (like 4G LTE or 5G) to place calls directly to residents’ phones. When a visitor presses a button, the system dials a predefined number—just like a traditional POTS system, but without relying on landlines.
Key Features
Calls to landlines or mobile phones
Keypad entry with PIN codes
Fob or card access
Remote programming
No need for building-wide wiring to each apartment
Advantages
Familiar functionality: Closely mimics traditional callboxes
Quick installation: Minimal infrastructure required
Reliable connectivity: Uses established cellular networks
Limitations
Limited advanced features: No video or app-based access in most models
Monthly service fees: Requires a cellular data plan
Depends on cellular reception quality: While we can install an antenna to improve reception, these systems are not ideal for areas that are known to have unreliable cellular service
IP Intercom Systems
How They Work
IP intercom systems connect to the internet via Ethernet. They use cloud-based platforms to manage communication, access control, and user data.
Key Features
Mobile app integration
Video calling
Access via pin codes, fobs, Bluetooth, smartphone app, QR code, facial recognition
Temporary access codes for visitors or deliveries
Real-time access logs and audit trails
Remote firmware updates and diagnostics
Centralized dashboard for multiple properties
Can be connected to an existing security camera system to continuously record footage
Advantages
Advanced functionality: Supports modern access methods and automation
Scalability: Easily expand across multiple buildings or locations
Enhanced security: Video, logs, and user tracking
Remote management: Add/remove users instantly
Limitations
Network dependency: Requires dedicated internet connection
Monthly service fee: Subscription plan required for app calling
Comparison: Cellular VS IP Intercom Systems
Feature | Cellular System | IP System |
Installation | Simple, minimal wiring | Moderate, requires network setup |
Monthly Fees | Cellular plan required | Internet + cloud subscription |
Video Capability | Typically no | Yes |
Mobile App Access | Limited | Extensive |
Access Methods | PIN, fob | App, PIN, fob, QR, Bluetooth, FR |
Remote Management | Basic | Advanced |
Scalability | Moderate | High |
Ideal For | Retrofit buildings that do not have internet | Managing multiple properties Tech-savvy residents |
To better illustrate the differences, let’s compare two typical systems—one cellular and one IP-based:
Cellular Intercom Spotlight: AES Multicom Classic Cellular Intercom
Audio-only callbox
Cellular network with antenna and extension if needed
Dials landlines or cell phones
Keyless entry via pin codes or fobs
Extension keypad with reader available for additional doors - such as parking lot entrances
Limited remote management via mobile app
No access logs
Higher initial hardware costs
Cellular service fees typically lower than the Akuvox IP system fees for buildings with 12+ apartments
IP Intercom Spotlight: Akuvox R29 Video Intercom System
Video intercom with touchscreen display
Requires internet for app calling
Dials landline, cell phone, mobile app, and indoor monitors (if applicable)
Multiple credential types – pin codes, fobs, QR, Bluetooth, facial recognition, app
Temporary access codes for couriers and guests
keypad with reader available for additional entry doors
Cloud-based dashboard for property managers with robust remote management features
Photo access logs
Lower initial hardware costs
Subscription fees typically lower than the AES cellular intercom for buildings with less than 12 apartments
While both systems eliminate the need for POTS lines, and are great retrofit options for older Philadelphia buildings, the IP system offers a broader feature set, particularly for buildings focused on modern tenant experience and security.
Common Misconceptions: Replacing Your POTS Callbox
“We have to rewire the entire building.”
Not necessarily. Both cellular and many IP systems are designed to work with minimal infrastructure. Cloud-based technologies reduce the need for invasive construction such as running wiring to each apartment.
“Cellular systems are outdated too.”
While cellular intercom systems may be simpler than IP systems, they are far from outdated. In fact, they’re still widely used and actively supported. For many properties, a cellular system is a practical and reliable upgrade. In some buildings, residents prefer the straightforward, no-fuss functionality of a cellular-based system, without the complexity or extra features of an IP system. It’s a proven solution that meets the needs of many properties without overcomplicating things.
“IP systems are too complicated.”
Modern platforms are designed with user-friendly interfaces. Most residents adapt quickly, especially when using familiar smartphone apps. Property managers love the intuitive remote management dashboard, where they can easily add or remote residents, update access codes, and view entry logs.
“Upgrading is optional.”
Waiting to upgrade your intercom system might seem like an option now, but it won’t be for much longer. As telecom providers phase out POTS lines, systems relying on them will eventually stop working.
Many of the inquiries we receive from property managers are urgent: their intercoms or callboxes have stopped working, and they need a solution ASAP. When this happens, you may be forced into a quick fix, which limits your options and could lead to spending money on a system that might not be the best long-term solution.
With a bit of preparation, you can plan ahead, explore different options, and choose the system that works best for your property’s future needs. Waiting until the last minute, especially when tenants depend on these systems for emergency or medical assistance, will restrict your choices. We’ve seen property managers replace outdated callboxes with temporary solutions, only to upgrade to a more advanced IP system a few years later when they realize it better meets their needs. Avoid this cycle by upgrading on your terms, not in a rush.
Preparing for the Transition: Upgrading Your Intercom
If your building currently relies on a POTS-based intercom, planning ahead is essential. Here’s how to get started:
Assess Your Current System
How many units does your building have?
Is there existing network infrastructure?
What features are currently in use?
Define Your Goals
Do you want to maintain basic functionality or upgrade to smart access?
Are security and audit logs a priority?
Do residents expect mobile app integration?
Evaluate Infrastructure
Check internet availability and reliability
Identify power and mounting locations
Consider cellular signal strength if going cellular
Budget Accordingly
Factor in equipment, installation, and ongoing service costs
Consider long-term savings from eliminating POTS lines
Choose the Right Vendor
Work with experienced integrators who understand both legacy systems and modern technologies. They can recommend the best solution based on your building’s layout and needs.
Conclusion
The phase-out of POTS lines marks the end of an era, but also the beginning of a smarter, more flexible approach to building access and communication. For Philadelphia businesses and property owners, upgrading to cellular or IP-based intercom systems may not be optional for long.
Cellular systems offer a straightforward, cost-effective path forward for those seeking continuity. IP systems, on the other hand, open the door to a fully modernized experience with enhanced security, convenience, and control.
Whichever route you choose, the key is to act proactively. Waiting until your POTS line fails could leave your building without a functioning entry system, scrambling for a last-minute solution.
Considering Replacing Your Telephone Entry System? Give us a call today to schedule a free estimate.
Want to Learn More About POTS lines?
For more information on the transition away from POTS and modern communication systems, consider these resources:
Industrial Networking: Why POTS lines are going away
FCC: Modernizing Telecommunications Networks – What Government Officials Need to Know
