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.

Recommended Brands for AU Small Business

For 2 to 8 phone deployments in Australian small business offices, TP-Link and Netgear are the most commonly sourced unmanaged POE switch options at the entry tier. The TP-Link TL-SG1008P provides 8 gigabit POE ports with a 65W total power budget for approximately $80 to $110 AUD through AU IT distributors and major online retailers. The Netgear GS308P is a comparable alternative at a similar price point and is widely stocked by Officeworks Business and IT resellers. Both options are reliable for pure phone deployments with no quality-of-service requirements beyond what the router provides. D-Link and ASUS produce comparable unmanaged POE switches in the same tier with similar performance and availability in the AU market.

For managed POE switches with VLAN and QoS capability, the Cisco SG350 series is the standard recommendation for AU small business environments running 6 or more phones or mixing VOIP with IP cameras or wireless access points. The Cisco SG350-10P sits at approximately $350 to $500 AUD and is well supported by AU IT service providers and readily available through distribution. Ubiquiti UniFi switches are a popular alternative, particularly for businesses already running UniFi networking infrastructure. The UniFi USW-8-150W (8 ports, 150W POE budget) is approximately $250 to $350 AUD and integrates with the UniFi Network controller for centralised management across all network devices. For larger offices (16 to 48 ports), the UniFi USW-24-POE or Cisco SG350-28P are the standard mid-market options.

Power Backup: What POE Means for Emergency Calls

Traditional PSTN handsets drew low-voltage power from the phone line itself and continued operating through mains power outages. VOIP phones, whether powered by a wall adapter or a POE switch, require mains power to function. When the power goes out, VOIP phones go offline unless backup power is in place. For businesses where phone availability during outages matters, including medical practices with after-hours lines, trades businesses with emergency contact numbers, legal offices with on-call requirements, and any business in a regional area with variable grid reliability, this is a practical infrastructure consideration that needs to be addressed during the initial deployment rather than after the first outage.

The standard solution is an uninterruptible power supply (UPS) connected to the POE switch and the internet router. A 600VA UPS can typically sustain a small 8-port POE switch and 4 to 6 standard IP phones for 30 to 60 minutes depending on the load, which covers the large majority of short outages and allows for orderly shutdown during extended ones. AU retail pricing for a suitable 600VA UPS from brands including APC, Eaton, and CyberPower is approximately $150 to $250 AUD from IT retailers and electrical wholesalers. The UPS plugs into the wall outlet, and both the POE switch and router plug into the UPS. For businesses with higher continuity requirements, a generator or higher-capacity UPS sized to the total switch and router load is the appropriate solution.

Cabling: What to Check Before Deploying POE

A POE switch is only as useful as the cabling infrastructure it connects through. POE over Cat5e cable runs up to 100 metres works reliably for standard 802.3af devices. Older Cat5 cable (non-Cat5e) can cause intermittent power delivery issues under full POE load over longer runs, particularly in buildings cabled before the mid-2000s when Cat5e became the standard. If your office has pre-existing structured cabling, confirm it is rated Cat5e or Cat6 before deploying a POE switch across legacy runs. For any new cable runs in Australia, Cat6 is the recommended minimum standard regardless of whether POE is in use, as the cost differential over Cat5e is minimal and the performance headroom is useful for future-proofing.

Wall plates and patch panels in older buildings are a secondary point of failure worth checking. Keystone jacks and patch panels that predate POE-rated hardware can cause intermittent power delivery issues that are genuinely difficult to diagnose, since the phone will register to the network but lose power sporadically or fail to power on reliably. If you are deploying into a building with existing structured cabling from before 2005, having the end-to-end cabling tested by an IT cabling contractor before committing to POE across all runs is a worthwhile investment. The cost of the switch is often the smallest component in a cabling-related POE problem. When cabling is uncertain, using power adapters for the short term while cabling is upgraded is a lower-risk path.

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.