---
title: "Which sidecars are compatible with 8x8?"
slug: "which-sidecars-are-compatible-with-8x8"
updated: 2026-05-11T10:47:30Z
published: 2026-05-21T21:27:32Z
canonical: "help.8x8.com/which-sidecars-are-compatible-with-8x8"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.8x8.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Which sidecars are compatible with 8x8?

## Question

Which sidecars (expansion modules) are compatible with 8x8?

## Applies To

- Poly
- Cisco
- Yealink
- Sidecars

## Answer

| **Sidecar** | **Supported Handsets** | **Number of Keys Supported for Each Sidecar** |
| --- | --- | --- |
| Poly VVX Sidecar 28-Key (Color) | - VVX 300,301,310,311 - VVX 400,401,410,411 - VVX 500,501 - VVX 600,601 | - Each sidecar allows three display pages with 28 keys on each; (3 x 28) = 84 keys per sidecar. - Maximum of three sidecars and up to nine display pages; 252 keys total. - Any unused button can be used for speed dial on the attached sidecars. |
| Poly VVX Sidecar 40-Key (Paper Label) | - VVX 300,301,310,311 - VVX 400,401,410,411 - VVX 500,501 - VVX 600,601 | - Each sidecar allows one display page with 40 line keys (1x 40) = 40 per sidecar. - Maximum of three sidecars and up to 120 line keys on paper display. |
| Poly VVX EM50 Sidecar | - VVX 450 | - Each sidecar allows three display pages with 30 line keys on each; (3 x 30) = 90 keys per sidecar. - Maximum of two sidecars and up to six display pages; 180 keys total. |
| Poly Edge EM 50 Expansion Module | - Edge E500 - Edge E400 | - Each sidecar allows three display pages with 22 line keys on each; (3 x 22) = 66 keys per sidecar. - Connect up to two sidecars with the E500 series and one with the E400 series. |
| Yealink EXP40 Expansion Module | - T46S - T48S - T46G - T48G | - Allows two display pages with 20 line keys on each; (2 x 20) = 40 keys per sidecar. |
| Yealink EXP43 Expansion Module | - T43U - T46U - T48U | - Allows three display pages with 20 line keys on each; (3 x 20) = 60 keys per sidecar. |
| Yealink EXP50 Expansion Module | - T53 - T53W - T54W - T57W | - Each sidecar allows three display pages with 20 line keys on each; (3 x 20) = 60 keys per sidecar. - Maximum of three sidecars daisy chained; 180 keys total. |
| Cisco IP Phone 8800 Sidecar | - 8851 - 8861 | - Each sidecar allows two display pages with 18 keys each; (2 x 18) = 36 keys per sidecar. - Connect up to three sidecars with the 8861 and up to two with the 8851. |
| Cisco IP Phone 8851/8861 Key Expansion Module | - 8851 - 8861 | - Each sidecar allows two display pages with 14 keys each; (2 x 14) = 28 keys per sidecar. - Connect up to three sidecars with the 8861 and up to two with the 8851. |

## Additional Information

For more information, see [Add and Configure Sidecars in 8x8 Admin Console](/support/docs/add-and-configure-sidecars-in-8x8-admin-console).