Click2dial not working on Firefox 39 (DTLS handshake failure)

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Click2dial is not working with the Latest Firefox 39 on my Environment.
And I can see same thing happening with doubango.org website call us button. 

What steps will reproduce the problem?
1.Go to doubango.org website using latest Firefox browser Version 39.
2.Click the Call us Button (you can see green button at right side of web page)
3. It is not working, I can see "DTLS-SRTP handshake failed" error on my 
Firefox console logs 

What is the expected output? What do you see instead?
Call should connect and play Voicemail IVR. Some Voicemail is playing when i 
call from chrome and opera. 

What version of the product are you using? On what operating system?
doubango.org call us button
Firefox 39.

Please provide any additional information below.
I am also attaching firefox logs, I am also getting the same error with my 
setup so what is causing this "DTLS-SRTP handshake failed" error in Firefox 39.

Original issue reported on code.google.com by [email protected] on 11 Aug 2015 at 7:48

Attachments:

• FF39