SIP Desk Phones

1. General Requirements

All listed desk phones meet the following standards:

• SIP protocol compliant (RFC standard)
• Compatible with Asterisk-based systems (e.g., Daktela)
• Support G.711 A-law codec and SIP over UDP (preferred), TCP, and TLS
• TLS 1.2+ supported; TLS 1.3 on most modern models
• Actively supported by the manufacturer (not End-of-Life or End-of-Support)

2. Supported SIP Desk Phones by Vendor

Yealink

T4U Series: SIP-T43U, SIP-T44U, SIP-T46U, SIP-T48U

T5W Series: SIP-T53W, SIP-T54W, SIP-T57W

DECT Models: W73P, W78P

Poly

CCX Series: CCX 400, CCX 500, CCX 600

Note: VVX Series is End-of-Life and should not be deployed.

Cisco

Supported Models: 8811 (MPP), 8841 (MPP), 8851 (MPP), 8861 (MPP), 8865 (MPP)

Note: Only devices with Cisco Multiplatform Firmware (MPP) are supported. Enterprise firmware is not compatible with SIP/Asterisk environments.

Snom

D7xx Series: D715, D717, D725N, D735, D765, D785, D785N

Grandstream

GRP Series: GRP2612, GRP2613, GRP2614, GRP2615, GRP2616

GXP21xx Series: GXP2130 v2/v3, GXP2140, GXP2160, GXP2170

iPECS (Ericsson-LG)

Supported Models: LIP-9071, LIP-9040, LIP-9030

Note: Do not include older LIP-8800/9800 models.

3. Microsoft Teams Compatibility via SIP Gateway

Microsoft Teams does not natively support SIP devices. However, Microsoft offers a SIP Gateway to connect selected certified SIP phones to Teams for basic call functionality.

Requirements:

• Device must be on the certified list (Yealink, Poly, Cisco)
• Must support TLS/SRTP and run approved firmware
• Requires Microsoft 365 license (e.g., E1/E3/E5)
• Provisioning to sip.pstnhub.microsoft.com and Teams login

Supported Examples:

• Yealink: T56A, T58A, MP54, MP56, MP58
• Poly: CCX 400, 500, 600, Trio C60
• Cisco: 8845, 8865 (Teams-certified firmware only)

Note: Teams SIP Gateway offers only basic calling features (no calendar, video, or directory sync). Suitable for hybrid deployments during transition to Microsoft Teams.

4. Final Recommendations

• Primary Choice: Yealink T4U and T5W series
• Teams-Capable Options: Poly CCX series, Cisco 8800 MPP, Yealink MP series
• Secure and Flexible: Snom D7xx, Grandstream GRP/GXP21xx
• Hybrid UC Support: Select certified models via Microsoft SIP Gateway