Yealink T42STwelve lines + USB headset + Opus codec.

Why the T42S is on the catalog.

The T42S adds two specific upgrades over the T42G: a USB 2.0 port and Opus codec support. The USB port enables wired Yealink/Jabra/Plantronics headsets to plug in directly for higher audio fidelity, and the Opus codec gives the phone better voice quality on lossy or congested network connections. For $10 more, both upgrades are easy to justify.

Where the 12-line capacity actually pays off: an attorney or CPA juggling separate DIDs for partners and practice areas, an MSP technician with extensions for multiple client tenants, a supervisor running multiple queue registrations. Twelve is a number that sounds excessive until you have a job that needs it, at which point six feels claustrophobic.

Where to skip it: any desk that only uses two or three lines. Save $20 and get the T41S — same chassis, half the SIP cap, same money saved per desk. Going the other direction, the T46G at $10 less gives you 16 lines on a bigger color screen — almost always the better upgrade.