您好DILIPBHAIM，

感谢您对Microsoft Office规范的查询。我们已经创建了一个调查此问题的事件，我将帮助您。

请发送您的网络跟踪以及帧号和密码，以便我们可以计算最终的哈希值，并在Microsoft.com验证输出到dochelp

感谢

Hello,

I am developing a custom Lync Clients, my clients can make call to each others using MS-ICE2 specification successfully. But When my client call to MS Lync client 2016, the ICE procedure always failed because the stun binding request I made can't be passed the verification of Ms Lync Client, the error like that ' hmac of message integrity failed on verification '.

This message integrity works perfectly fine with 2015 client. However whenever i am trying to communicate to lync client 2016 message integrity is getting failed.  For 2015 client, i have followed the steps provided in this blog :

https://blogs.msdn.microsoft.com/openspecification/2016/02/23/verifying-stun-message-integrity-for-lync-and-skype-for-business-ice-traffic/

Can you please share the steps to create message-integrity for STUN bind request n response for 2016 clients. This seems to have changed for MS-IMPLEMNTATION-VERSION 3 or greater version onwards.

Thank you very much!

Hi DILIPBHAIM,

Thank you for your inquiry about Microsoft Office Specifications. We have created an incident for investigating this issue and I'll be helping you out.

Kindly send your network trace along with frame numbers and password so that we can calculate the hash at our end and verify the output to dochelp at Microsoft.com

Thanks