AudioCodes 400HD Series

Other manuals for AudioCodes 400HD Series

Administrator's Manual235 pages

User Manual60 pages

Questions and Answers:

J
james75Aug 29, 2025
How to fix 'Failed to validate certificate' on AudioCodes 400HD?
- K
  Kim ValdezAug 29, 2025
  If your AudioCodes IP Phone shows 'Failed to validate certificate' or 'Failed to obtain user certificate': * Make sure DHCP Option 43, sub-option 5, was enabled in the DHCP server. If it wasn't, enable it. * Make sure you can access the Skype for Business Web service URL: https://lyncsvrWebPoolFQDN:443/CertProv/CertProvisioningService.svc * Query the LDAP server: _ldap._tcp.. Make sure it was enabled. If it wasn't, enable it in order to get the root certificate.
M
matthewsanneAug 28, 2025
Why does my AudioCodes 400HD IP Phone say 'Failed to connect server'?
- G
  Gary SmithAug 28, 2025
  If your AudioCodes IP Phone displays 'Failed to connect server' or 'Cannot find Lync server at ', ensure that at least one of the following is enabled in the DNS server: _sipinternaltls._tcp. (for TLS), DHCP results (Option 120) (for TLS), _sipinternal._tcp. (for TCP), DHCP results (Option 120) (for TCP), _sip._tls. (for TLS), _sip._tcp. (for TCP).
C
cherylmartinezAug 27, 2025
What to do if AudioCodes 400HD IP Phone fails to connect to time server?
- E
  Edward ArmstrongAug 27, 2025
  If your AudioCodes IP Phone displays 'Failed to connect to time server' or 'PIN internal error', ensure that at least one of the following is configured to enable synchronization: NTP server via DNS SRV record (_ntp._udp. pointing to NTP server), NTP server returned via DHCP Option 42, Time.windows.com, Time.nist.gov, or a manually configured Configuration Parameter.
D
Debbie HendersonAug 26, 2025
Why does my AudioCodes IP Phone headset have no audio?
- D
  Daniel HerreraAug 27, 2025
  If you're not getting any sound through your AudioCodes IP Phone headset, first ensure it's securely plugged into the headset port on the phone's side. Also, check that the headset volume is set to an audible level.
M
mcbridecarolAug 25, 2025
What to do if my AudioCodes 400HD is off?
- S
  Stacey HarmonAug 26, 2025
  If your AudioCodes IP Phone isn't turning on, start by ensuring the AC/DC power adapter is firmly connected to the DC input on the phone's rear and plugged into a functional electrical outlet. If you're using Power over Ethernet (PoE), contact your network administrator to verify the switch is providing power to the phone.
H
Hayden MaynardAug 25, 2025
How to improve poor LCD display on AudioCodes IP Phone?
- P
  Parker MillerAug 25, 2025
  If the LCD display on your AudioCodes IP Phone is poor, try adjusting the phone’s screen contrast level and the screen’s backlight timeout.

AudioCodes 400HD Series Specifications

General

Type	IP Phone
Audio Quality	HD Voice
Ethernet Ports	2
Display	Graphical LCD
Display Size	2.8 inches
Connectivity	Ethernet
Power over Ethernet	Yes
Headset Port	Yes (3.5mm)
Supported Codecs	G.711, G.722, G.729, iLBC, Opus
Supported Protocols	SIP, RTP, RTCP, HTTP, HTTPS, TFTP, DNS, DHCP, TLS, SRTP