Collection: VoIP Phones

SIP (Session Initiation Protocol) is the standard signaling protocol used by virtually all modern cloud PBX and on-premise phone systems. Any SIP-compliant phone can register with any SIP-compatible system — RingCentral, 8x8, 3CX, FreePBX — using credentials from your PBX admin portal. If your phone system is SIP-based, all phones in this collection will work with it.

A standard SIP phone registers using SIP credentials from your PBX and works with any SIP-compatible system. A Teams-certified phone (like Yealink T55A) runs the Teams Android client natively and auto-provisions from the Teams Admin Center — no SIP credentials required. If your business uses Microsoft Teams Phone as its phone system, a Teams-certified phone delivers the best native experience.

Most SIP desk phones support PoE (802.3af or 802.3at) and draw power from the network switch — no power adapter at the desk. If your switch doesn't support PoE, a PoE injector (one per phone) solves this at low cost. Some phones ship with an AC power adapter included; check the product listing.

Each active call uses approximately 80–100 Kbps of symmetric bandwidth. More important than raw bandwidth is network stability — latency under 150ms one-way, jitter under 30ms, and packet loss under 1%. Configure QoS on your switch and router to prioritize voice traffic (DSCP EF or VLAN-based), especially in offices where internet is shared with video conferencing or large file transfers.

Yes — any SIP-compliant phone registers alongside other brands on the same PBX. Each phone gets its own SIP extension and credentials. The only exception: Teams-certified phones connect directly to Microsoft's cloud and bypass SIP entirely — they cannot share an extension with a standard SIP phone on a separate PBX.