Editorial Technical Reference

Enterprise VoIP desk phone

SIP desk phones for business · PoE class and switch power budget, codecs and wideband audio, SIP accounts, ports, display and environmental limits

An enterprise VoIP desk phone is a SIP endpoint with handset, keypad, display and network ports that registers to an IP PBX or cloud phone system and can take its power from the network cable. Pin down three things before comparing models: the PoE class and how many phones your switches must power, the codecs and audio bandwidth your platform uses, and the number of SIP accounts, line keys, network ports and accessories each user needs.

Wired SIP desk phones for offices and contact centres, including their PoE and adapter power, audio and network interfaces. DECT cordless phones, video phones, conference speakerphones, door phones, analogue telephone adapters and softphones are outside this page.

CNFX editorial research · Sources checked October 11, 2026 · 5 sources

Budget PoE powerSet codecs and accounts
Black desk telephone with corded handset, keypad and colour screen on a wooden desk, a blue network cable plugged in, with a network switch rack behind
Desk phone connected to the network beside a switch rack

Start with your task

Budget PoE powerClass and switch load. Set codecs and accountsAudio, SIP, ports.

01

Budget the PoE class across your switches

Snom's data sheet for its D865 desk phone lists power over Ethernet to IEEE 802.3af, class 3, with IEEE 802.3az as a software option, and an alternative power adapter (available separately) rated 100–240 V AC, 50–60 Hz input and 5 V DC, 2 A, 10 W output. [1]

Texas Instruments' data sheet for its TPS2378 PoE powered-device controller tabulates the IEEE 802.3at power classes at the powered device: class 1 up to 3.84 W, class 2 from 3.84 to 6.49 W, class 3 from 6.49 to 12.95 W, class 0 from 0.44 to 12.95 W and class 4 from 12.95 to 25.5 W. It says the maximum power in that table determines the class the device must advertise and that the switch may disconnect a device drawing more than its stated class power. [2]

Editorial calculation: a 48-port switch feeding 48 class 3 phones must be able to deliver up to 48 × 12.95 = 621.6 W at the phones, before cable losses and any expansion modules or USB accessories. Compare that with the switch's PoE budget and how it allocates power per class.

Editorial note: in a mixed fleet, read the PoE class from each model's data sheet rather than assuming one value for all phones. [1]

Give the supplier the call platform and SIP server, number of users and roles, line or BLF keys per user, codecs required, PoE class and switch budget, VLAN and security requirements, provisioning method, headset and accessory needs, languages and quantities per model.

02

Set codecs, audio bandwidth and SIP accounts

The ITU-T titles Recommendation G.722 as 7 kHz audio coding within 64 kbit/s. [3] Snom's D865 data sheet lists the codecs G.711 (A-law and µ-law), G.722, G.723.1, G.726, G.729 and Opus, a speakerphone frequency range of 100 Hz–8.0 kHz and a handset range of 150 Hz–8.0 kHz, full-duplex HD audio, packet-loss concealment, an adaptive jitter buffer and hearing-aid compatibility. [1]

The same data sheet lists 12 SIP identities and up to 12 simultaneous calls; SIP, SDP, RTP, RTCP and RTCP-XR with SIPS (SIP over TLS) and SRTP; two Gigabit Ethernet RJ45 ports; two USB 2.0 ports; RJ9 handset and headset sockets; a 5.0 in, 1,280 × 720 tiltable colour display; 10 programmable keys with up to 40 functions over four pages; provisioning by HTTP, HTTPS or TFTP with DHCP options 43, 60, 66 and 67 and TR-069; operating temperature 0 to +35 °C; and humidity 5–95% non-condensing. Dimensions are about 193 × 243 × 165 mm with footstand and weight about 1.12 kg. [1]

Editorial note: wideband audio needs both ends and the call path to support the same codec. Confirm which codecs your PBX or cloud platform and trunks offer, and list them in order of preference in the request.

A linked supplier describes its V64 business phone as having a colour LCD screen, built-in Bluetooth 4.2 and 2.4 GHz/5 GHz Wi-Fi, and lists V-series models from the V50 to the V67. [5] [4]

03

IP phone listings and the data sheets they leave out

The listing reviewed offers a range of business IP phones from basic to video models, but its model pages refer specifications to local sales; ask for the data sheet of each model with PoE class, codecs, SIP accounts and environmental limits.

04

Trace what each part of the phone controls

PartRoleFix in the order
Network portsUplink and PC pass-through; Gigabit. [1]Speed; count.
PoE inputPower class from the switch. [1] [2]Class; adapter option.
Handset and speakerAudio range and HD audio. [1]Frequency range; HAC.
Codec and SIP stackCodecs, accounts, encryption. [1] [3]Codec list; accounts; TLS/SRTP.
Display and keysStatus and line keys. [1]Size; key count.
Wireless and USBBluetooth, Wi-Fi, accessories. [1] [5]Needed or not.

05

Ports, PoE class, codecs and climate limits per desk phone model

The example values come from Snom's D865 data sheet and TI's PoE class table; request the same fields for each model in the quote.

FieldWhat it means and published valuesAsk the supplier for
Network Ports (count)Example: 2 × Gigabit RJ45. [1]Ports; speed.
PoE Support (standard)Example: 802.3af class 3; class 3 ≤12.95 W. [1] [2]Standard; class.
Display Resolution (pixels)Example: 1,280 × 720, 5.0 in. [1]Size; resolution.
Frequency Response (Hz)Example: 100–8,000 speaker; 150–8,000 handset. [1]Ranges.
SIP Accounts (count)Example: 12 identities. [1]Accounts; calls.
Operating Temperature (°C)Example: 0 to +35. [1]Range.
Power Consumption (W)Within the advertised PoE class. [2]Maximum W.
Dimensions (W×D×H) (mm)Example: about 193 × 243 × 165 with stand. [1]Dimensions.
Weight (kg)Example: about 1.12. [1]Weight.
Audio CodecsExample: G.711, G.722, G.729, Opus. [1] [3]Codec list.
Ethernet Standard (Mbps)Example: Gigabit. [1]Speed.
Power Adapter Input (V AC)Example: 100–240 V AC, 50–60 Hz. [1]Adapter; included or not.
Humidity (%RH)Example: 5–95% non-condensing. [1]Range.
IP RatingIndoor desk use.Rating if needed.

06

Send the platform, power and user data together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Platform: [PBX or cloud; SIP server]
Users: [count by role; keys per user]
Audio: [codecs in order; HD audio]
Power: [PoE class; switch budget; adapters]
Network: [ports; VLAN; IPv6]
Security: [TLS; SRTP; provisioning]
Accessories: [headsets; expansion modules]
Supply: [quantities; languages; warranty]

See manufacturer records Send an enquiry through CNFX

Compare VoIP desk phone suppliers

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Fanvil
Manufacturing site to be confirmed for the order

Lists V-series business IP phones from the V50 to the V67, including the V64 with colour LCD, Bluetooth 4.2 and dual-band Wi-Fi.

Product scope checked 2026-10-11

Current product source ↗

Business IP phones listed · profile compiled by CNFX from public sources
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Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 13 October 2026

Buyer questions

How much PoE power does a class 3 desk phone draw?

TI's PoE controller data sheet gives class 3 as 6.49 to 12.95 W at the powered device. [2]

What is G.722?

The ITU-T titles G.722 as 7 kHz audio coding within 64 kbit/s. [3]

How many SIP accounts does a business desk phone support?

Snom's D865 data sheet lists 12 SIP identities and up to 12 simultaneous calls. [1]

What operating temperature do desk phones allow?

Snom's D865 data sheet lists 0 to +35 °C and 5–95% non-condensing humidity. [1]

Sources and what still needs a direct check

Sources checked 2026-10-11. Snom is a SIP phone maker publishing a model data sheet; Texas Instruments publishes PoE class limits in a powered-device controller data sheet; the ITU-T publishes the G.722 recommendation; Fanvil is a linked supplier.

  1. Snom — D865 desk phone product page and data sheet (V 6/16/2026-2) ↗ Maker data sheet Return to text ↑
  2. Texas Instruments — TPS2378 IEEE 802.3at PoE PD controller data sheet ↗ Semiconductor data sheet Return to text ↑
  3. ITU-T — Recommendation G.722: 7 kHz audio-coding within 64 kbit/s ↗ Standards body page Return to text ↑
  4. Fanvil — V Series business IP phones ↗ Supplier product range page Return to text ↑
  5. Fanvil — V64 Prime business phone ↗ Supplier product page Return to text ↑

Still to check yourself

  • Count PoE class and switch budget.
  • List codecs for your platform.
  • Fix SIP accounts, keys and ports.
  • Confirm environment and accessories.
  • Verify the legal supplier and maker.
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