AudioCodes 420HD – Failed to validate server

AudioCodes 420HD can be a good replacement for Lync Phone Editions, at least regarding its price. However, don’t expect to have all the features that exist in the Lync Phone Editions. In addition, AudioCodes has already promised to enable Better Together over Ethernet to 420HD, 430HD and 440HD in a future firmware release.

The provisioning of these phones is different, but I strongly recommend that you prepare the same requirements as needed by Lync Phone Edition Phones. Jeff Schertz has a great article on how to configure the requirements:

Configuring Lync Server for Phone Edition Devices
http://blog.schertz.name/2010/12/configuring-lync-server-for-phone-edition-devices/

Now that we have configured the requirements, let’s go back to the phone. 420HD supports two methods of authentication, one by using Sign-in address:

AC420HDServer07

Another by using Phone Extension:

AC420HDServer09

To change the Sign-in method, we use the option Switch sign-in method that is available in the Sign in menu:

AC420HDServer08

After setting the method and trying to sign in, I got the error saying that Failed to validate server:

AC420HDServer01

In this case, I thought that it had to do with certificates and that the phone didn’t trust Lync Server certificate issued by the internal CA.

The phone firmware version was updated to 2.0.1.44.21:

AC420HDServer02

We can install the internal root CA in the phone. The first step is to go to Configuration>Security>Security:

AC420HDServer05

In this page we can see that the CA certificate is empty:

AC420HDServer03

To load the certificate, select Choose File, then select the proper certificate (*.cer). After selecting we need to Load the certificate.

AC420HDServer04

Almost done. Just reboot the phone and try to sign in again:

AC420HDServer06

2 thoughts on “AudioCodes 420HD – Failed to validate server

  1. David – thanks for the write-up, I’m sure others out there will find the information helpful.

    We’ve got some other new products and software revisions on the way – would love to stay in touch and give you an early opportunity to test them!

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