Do You Need a POE Switch for VOIP Phones? The Honest Answer

This guide explains what POE is, how it applies to IP desk phones, when a dedicated POE switch is necessary versus optional, and what to look for if you do need one. It is written for small Australian businesses setting up a VOIP phone system and trying to work out whether there is additional network hardware required beyond the phones themselves.

What POE Is

POE stands for Power over Ethernet. It is a standard that allows a network cable to carry both data and electrical power to a connected device. Think of it as a two-in-one cable: instead of running a separate power adapter from the phone to a wall socket, the Ethernet cable that connects the phone to your network also powers it. For a comparison of current options, see our guide to the best SIP desk phones in Australia.

A POE switch is a network switch. The box that your devices connect to via Ethernet cables. That has POE capability built in. Each POE port on the switch provides power to a device connected to it. The device detects that POE is available and draws power from the cable instead of from a separate adapter.

Do IP Phones Require POE?

IP phones support POE but do not require it. Every current Yealink and Grandstream IP desk phone ships with a power adapter in the box. If you plug that adapter into a wall socket, the phone will power on and work regardless of whether your network switch provides POE. POE is a convenience option, not a requirement.

The reason POE is common in IP phone deployments is practical: it removes one cable per phone. Without POE, each phone needs an Ethernet cable to the switch and a power adapter to a wall socket. With POE, only the Ethernet cable is required. For a five-phone office, that is five fewer power adapters and five fewer power points consumed. For larger deployments, the cable management benefit is significant.

When You Need a POE Switch

You need a POE switch if you want to power your phones via the network cable rather than individual adapters, and your current network switch does not support POE. This is a valid choice but not a mandatory one. The decision usually comes down to cable management preference and available power points near each phone location.

There is one scenario where POE is strongly recommended: if your phones are in locations where there is no nearby power point or where running additional power cabling would be difficult. This is common in reception areas, meeting rooms, and warehouses where desk placement does not align with power outlets. In these cases, POE eliminates the need to run power to the phone location separately.

When You Do Not Need a POE Switch

If every phone desk has a nearby power point and you are comfortable using the included power adapters, you do not need a POE switch. Your existing non-POE network switch will connect the phones to the VOIP service via Ethernet, and the phones will power via their adapters. This is a perfectly workable setup and the most common configuration for small offices setting up VOIP for the first time.

Similarly, if you are replacing a small unmanaged switch with a POE switch purely for the phone setup, factor in whether the cost is justified. For a two or three phone office where power points are readily available, using the included adapters and an existing non-POE switch is a simpler and cheaper starting point.

What to Look For in a POE Switch for VOIP

POE Standard: 802.3af vs 802.3at

Most current IP desk phones require either 802.3af POE (maximum 15.4W per port) or 802.3at POE+ (maximum 30W per port). Standard desk phones like the Yealink T33G, T46U, and T54W are 802.3af devices drawing 3 to 5W. Higher-end phones with colour touchscreens and Wi-Fi may draw up to 10W, still within 802.3af. POE+ is generally not required for standard IP desk phones.

An 802.3af switch will power all standard IP desk phones. If you are also connecting IP cameras or wireless access points via POE, check their power requirements. Those devices often need 802.3at.

Total POE Budget

Every POE switch has a total power budget. The maximum combined wattage it can deliver across all POE ports simultaneously. A switch might have 8 POE ports rated at 15.4W each but a total budget of only 60W, meaning all 8 ports cannot run at full power simultaneously. For IP phones drawing 3 to 5W each, this is rarely a practical constraint. Eight phones at 5W each require 40W total, well within most small switch budgets.

Check the total POE budget only if you are also powering other devices (cameras, access points) from the same switch, or if you are planning significant expansion.

Managed vs Unmanaged

A managed switch is a network switch with configurable settings. You can create VLANs (virtual local area networks), set QoS (quality of service) priority rules, and monitor traffic per port. An unmanaged switch has no configuration options. It plugs in and works immediately with no setup required.

For VOIP specifically, a managed switch allows you to configure QoS, which prioritises voice traffic on your network over other data. This reduces call quality issues during periods of high network activity. For most small offices with fewer than 10 phones and a modern NBN connection, an unmanaged switch is adequate. For offices with higher call volumes, video conferencing, or bandwidth-heavy operations running simultaneously, a managed switch with QoS configured is worth the modest additional cost.

AU Pricing Guide for Small Office POE Switches

For a small office (2 to 8 phones), an unmanaged 8-port POE switch from a reputable brand (TP-Link, Netgear, D-Link) costs approximately $60 to $120 AUD. These are widely available through AU retailers and are adequate for standard IP phone deployments.

A managed 8-port POE switch suitable for VOIP with QoS capability costs approximately $150 to $300 AUD depending on brand and specification. TP-Link's TL-SG2008P and Netgear's GS308EP are common choices in this price range for small offices.

For larger offices (10 to 24 phones), 24-port managed POE switches are available from $300 to $600 AUD. Cisco, Ubiquiti, and TP-Link all have options in this range with strong AU availability and local warranty support.

The VLAN Consideration for VOIP

A VLAN, or virtual local area network, is a way of logically separating traffic on a physical network. Putting your VOIP phones on a separate VLAN from your computers and other devices is a best practice for larger deployments. It improves call quality (voice traffic is isolated from competing data), simplifies QoS configuration, and improves network security.

For a small office with two to five phones on a modern NBN connection, VLAN separation is a recommendation rather than a requirement. If your VOIP provider's support team recommends it, or if you experience call quality issues, ask your network person to configure a voice VLAN. If you have no IT support, start with a simple setup and optimise later if needed.

What Most Businesses Get Wrong

The most common mistake is buying a POE switch before checking whether phones include power adapters. All current Yealink and Grandstream models include adapters. A POE switch is a convenience choice, not a requirement. Make the decision based on your cable management preference, not on a false assumption that it is mandatory.

The second mistake is confusing POE standard support with total power budget. A switch rated for 8 POE ports at 15.4W each may have a total budget of 65W, meaning sustained simultaneous full-power operation on all ports is not possible. For phones drawing 3 to 5W each, this is not a practical problem, but it is worth checking if you plan to add cameras or access points to the same switch.

The third mistake is buying an unmanaged switch for a higher-call-volume environment and then troubleshooting call quality issues that a QoS-capable managed switch would have prevented. If your business takes more than 20 calls per day across multiple phones, spend the extra $80 to $100 on a managed switch with QoS from the outset.

Your Next Steps

Check whether your intended phones include power adapters (they almost certainly do). Decide whether POE is the right choice for your cable management situation. If your existing switch is non-POE and you decide to use adapters, no new switch hardware is needed. Connect the phones via Ethernet and plug the adapters into wall sockets. If you want POE or if your current switch needs replacement, an 8-port unmanaged POE switch for $60 to $120 AUD covers most small office setups.

For the next step in your phone setup, see our new IP phone setup guide for the full provisioning walkthrough, or our guide to setting up business phones on NBN for the network preparation steps.