Are Office Phone Systems Finally Becoming Obsolete?

Office phone systems are not obsolete, but the desk phone on every desk is. For most knowledge workers, Microsoft Teams Phone on a laptop and a mobile app has replaced the handset. Reception counters, shared spaces, executives who live on calls, call-handling teams and staff on the move around a site still work better with a dedicated phone, and for them the right answer in 2026 is a Teams-certified IP phone or a DECT cordless system rather than nothing.

Below: both sides, SourceIT's verdict, and the devices that still earn desk space, including the Yealink MP58-WH E2 Teams Executive Phone, Yealink MP45 Teams USB Phone, Yealink SIP-T53, Yealink W73P IP DECT Phone System and Yealink W59R Rugged DECT Handset.

Who still needs a desk phone, and who does not?

The case that office phone systems are obsolete

The argument is strong. Microsoft describes Teams Phone as a way to "replace your existing PBX system with a set of features delivered from the same platform that provides your enterprise productivity tools". Calls between Teams users in the same organisation are handled natively in Teams and, in Microsoft's words, "never go to the Public Switched Telephone Network (PSTN), removing operator toll costs" for internal calls. It runs in the desktop and mobile Teams clients and includes auto attendants and call queues.

For a hybrid team, a fixed extension on a fixed desk is the wrong shape. A softphone follows the person to home, client sites and hot desks, and nobody moves a handset when the seating plan changes. Add a decent headset and, for many roles, the desk phone has nothing left to do.

Retiring an ageing on-premises PBX also removes a box, a maintenance contract and a device type from the asset register. For what to do with the retired kit, see our post on office e-waste disguised as innovation.

The case for keeping dedicated phones

The other side is just as practical. Softphones depend on a logged-in laptop, a working headset and a person who is at the screen. That suits a consultant, not a reception counter. Microsoft itself has a device category for this: a common area phone, which it says "is typically placed in an area like a lobby, reception area, or a conference room and is available to many people to make a call". It signs in with a resource account rather than a person, using a Teams Shared Devices licence, so the lobby phone keeps working when staff change.

Then there are the people whose job is the phone. Call-handling teams, sales desks and executives who take back-to-back calls benefit from a dedicated device with a proper handset, speakerphone and physical keys. Microsoft's phone guidance highlights hot-desking (sign in, get your contacts, sign out for the next person) and "Better together", where a phone locks and unlocks with a Windows PC running Teams.

Finally, there is reliability. Microsoft notes that if a Teams phone "isn't signed in, or if it doesn't have an Internet connection", emergency calls cannot be placed. Any cloud calling setup, softphones included, needs a fallback for network or power outages, such as mobiles and a UPS on the network switch.

Does Teams Phone need a phone line?

Yes, for calls to and from ordinary phone numbers. Microsoft is clear that a PSTN solution "is separate from a Teams Phone license". The licence gives a user enhanced calling and access to the PSTN; the PSTN solution provides the phone numbers and the domestic, international and emergency calling. Microsoft lists four ways to connect: Microsoft Teams Calling Plan (Microsoft as the operator), Operator Connect (certified third-party landline operators), Teams Phone Mobile (certified mobile operators) and Direct Routing (any PSTN operator through your own connection). Check which options your Singapore carrier offers before planning a cut-over.

Licences are a recurring cost; our post Your Company Has 20 Different IT Subscriptions. Who's Actually Tracking Them? has a tracking sheet you can adapt for these seats.

Which phones still make sense in 2026?

For executives and heavy callers on Teams, the Yealink MP58-WH E2 Teams Executive Phone (S$608.85) runs Teams on Android 13 with a 7-inch touch screen and ships with the BTH58 Bluetooth wireless handset, which the listing rates for up to 17 hours of talk time. It runs from an 802.3af PoE switch.

For people who mostly work on a PC but want a physical handset, the Yealink MP45 Teams USB Phone (S$133.65) connects to the computer over USB and gives Teams a 4-inch touch screen and handset.

For reception desks and general extensions on a SIP-based phone system or hosted PBX, the Yealink SIP-T53 Prime Business IP Phone (S$180.90) has a 3.7-inch adjustable screen and, per the listing, up to 12 VoIP accounts and 5-way conferencing. See the Yealink MP Series IP Phones collection for the other Teams and Zoom models, and our earlier MP54 vs MP56 vs MP58 comparison and best IP phone picks for more detail.

Is DECT still worth it for staff who move around?

For staff who are never at a desk, DECT is the part of the office phone system least likely to disappear. A cordless handset gives a floor, kitchen or warehouse team a work number without using personal mobiles. Yealink states that the W73P supports up to 10 W73H handsets and up to 10 SIP accounts on one base, with up to 6 optional repeaters for wider coverage. The Yealink W73P IP DECT Phone System (S$199.80) bundles the W70B base with a W73H handset, which the listing rates for up to 35 hours of talk time.

For harsher environments, the Yealink W59R Rugged DECT Handset (S$232.20) is IP67-rated, built for drops of up to 2.5 metres according to the listing, and has push-button, no-movement and man-down alarms for lone workers. The listing notes it registers to the W70B base, so it can join a W73P system as an extra handset. Note that these W-series systems are open-SIP devices; the listing states they are not Teams or Zoom certified endpoints, so they connect to a SIP platform. Browse Yealink DECT Cordless Phones for the full range, and if your question is about headsets rather than handsets, read DECT vs Bluetooth headset for the office.

SourceIT's verdict

The office phone system is not dying; it is shrinking and moving to the cloud. The PBX box and the handset on every desk are going, replaced by cloud calling, good headsets and a short list of dedicated devices where a phone does a job a laptop cannot.

Stop buying phones for desks. Buy phones for roles: reception, executives, call handlers and people on the move.

Map every role against the table above, keep fixed phones for shared spaces and call-heavy roles, give everyone else a headset, and settle your PSTN route and licence count early. If you prefer to spread hardware costs, our post Is Device-as-a-Service the Future of IT or Just Another Monthly Bill? compares buying and paying monthly. For personal devices joining the network, see Should Companies Ban Personal Laptops From Their Office Network?

Buying IP phones and DECT systems in Singapore

SourceIT supplies Yealink in Singapore; the listings above state 1 year local warranty, and you should confirm the term for your SKU when requesting a quote. Prices are as listed on 23 Oct 2026 (MP45 checked 24 Oct 2026); all had stock. Tell us your user count, shared spaces and platform (Teams Phone or SIP) and we will suggest a mix. Use Request for Quotation on the product page, call (65) 6978 3502, email Sales@sourceit.com.sg, see our volume discounts or use the contact page. SourceIT is GeBIZ and Vendors@Gov registered for government buyers.

Frequently asked questions

Are desk phones obsolete? Not entirely. For most hybrid staff a softphone and headset are enough, but reception, shared spaces, executives, call-handling teams and mobile site staff still benefit from dedicated IP or DECT phones.

Can Microsoft Teams replace a PBX? Microsoft positions Teams Phone as a way to replace an existing PBX, with auto attendants and call queues. You still need a PSTN solution for external numbers.

Does Teams Phone include phone numbers? No. Microsoft says a PSTN solution is separate from the Teams Phone licence. Options are Calling Plan, Operator Connect, Teams Phone Mobile and Direct Routing, depending on availability.

What is a Teams common area phone? A Teams phone placed in a lobby, reception or meeting room that signs in with a resource account rather than a person, using a Teams Shared Devices licence.

Do DECT phones work with Teams? The Yealink W-series DECT systems listed by SourceIT are open-SIP devices and are not Teams-certified endpoints, so they connect to a SIP phone platform. Ask us about the right setup for Teams environments.