Auerswald COMfortel C-400 — conference phone with four wireless microphones
SIP conference phone4 wireless DECT mics3 SIP accountsGigabit LAN
The Auerswald COMfortel C-400 is a professional SIP conference phone for meeting rooms. Besides two microphones in the base, it comes with four wireless DECT microphones that can be placed along the table, so participants at the far end of a long table are heard as clearly as those next to the phone.
It suits small, medium and large meeting rooms in offices, practices and schools that use a SIP phone system — Auerswald COMtrexx, COMpact or COMmander, or third-party platforms such as Asterisk and hosted PBX services.
Before you order: Works with Auerswald COMtrexx Next/Flex/Business, COMpact 4000/5200/5200R/5500R, COMmander 6000 series and COMuniq ONE, plus Asterisk, IP-Centrex and hosted SIP. G.722 wideband audio needs a platform that supports it (e.g. COMpact firmware 7.2 or later).
What's in the Box
- C-400 base unit
- 4 wireless DECT microphones with 4 Ni-MH batteries
- PoE power supply with cable
- 2 RJ-45 LAN cables (approx. 2 m and 7.5 m)
- USB cable
- Manual
What It Means in Practice
- The wireless microphones run up to 8 hours per charge (up to 70 hours standby) — enough for a full day of meetings.
- Full-duplex hands-free with echo cancellation lets people talk over each other naturally.
- The included PoE power supply means only one network cable runs to the table.
- Up to 3 SIP accounts, so one room phone can carry more than one line.
What Will Not Work
- It has no Bluetooth or USB audio for laptop video calls — it is a SIP phone, not a USB speakerphone.
- It is not a video conferencing system.
- G.722 HD audio only works if the phone system supports it.
- Not an analogue phone — it needs a SIP PBX or SIP provider.
Key Features
Wireless table mics
4 DECT 6.0 microphones plus 2 fixed in the base for full room coverage.
Clear audio
Full-duplex hands-free, echo cancellation and G.722 wideband.
Business-ready SIP
3 SIP accounts, SRTP/TLS security, VLAN and DiffServ for QoS.
Simple install
Gigabit LAN with included PoE power supply and two LAN cables.
Technical Specifications
| Identification |
| Brand |
Auerswald |
| Model |
COMfortel C-400 |
| Part Number |
90076 |
| EAN / GTIN |
4019377900765 |
| Colour |
Black |
| Audio & Microphones |
| Microphones |
2 fixed in the base + 4 wireless DECT 6.0 microphones |
| Microphone battery |
Ni-MH 2.4 V 400 mAh |
| Talk / standby time |
Up to 8 h / up to 70 h |
| Hands-free |
Full duplex, echo cancellation, comfort noise |
| Network & VoIP |
| Network |
Ethernet 10/100/1000 |
| USB |
1× micro-USB |
| SIP accounts |
3 |
| Protocols |
SIP RFC 3261, STUN, RFC 2833 DTMF, VLAN 802.1q, DiffServ |
| Codecs |
G.722, G.711 µ/A-law, G.726, G.729 |
| Security |
SRTP, TLS, Digest MD5 |
| Display & Keys |
| Display |
Backlit monochrome LCD, 158 × 57 px |
| Keys |
Dial pad, 10 programmable speed-dial keys, 8 function keys, 3 softkeys |
| LEDs |
4 multicolour |
| Power & Physical |
| Power |
Via included PoE power supply |
| Consumption |
2.5–5 W |
| Dimensions (W×H×D) |
272 × 67 × 340 mm |
| Weight |
Approx. 1,100 g |
| Warranty |
| Warranty |
1-Year Warranty (Singular) |
| Manufacturer Term |
24-month Auerswald manufacturer warranty from date of purchase (outside Germany via the local importer) — claims handled through Singular |
Frequently Asked Questions
Can I use it with Teams or Zoom on a laptop?
Not directly — it has no USB audio or Bluetooth. It works as a SIP phone; join via your PBX or dial-in.
How long do the wireless microphones last?
Up to 8 hours of talk time per charge and up to 70 hours standby.
Does it work with non-Auerswald PBXs?
Yes, it supports Asterisk, IP-Centrex, hosted and soft PBXs via standard SIP.
Singular Expert Insight · Buyer's Guide
Long tables are where ordinary conference phones fail; the C-400’s four wireless microphones solve exactly that without running extra cables. If your meetings are mostly laptop-based video calls, a USB speakerphone may suit better — if they are phone calls over your PBX, the C-400 is the stronger choice. See our
VoIP accessories for PoE and cabling.
✓ Buy it if you hold phone conferences in medium or large rooms on a SIP system.
✕ Skip it if you need a USB/Bluetooth speakerphone for laptop video calls.
→ Also consider Auerswald COMtrexx Next PBX for the room’s SIP line.
Not sure it fits your setup? Send us the model of your rack, switch or device and we will check compatibility before you order.