Res_srtp.c: SRTCP unprotect failed because of authentication failure

[hardocp]

I am running a plain vanilla version of Asterisk 16.7 and FreePBX 14

I just started getting the following error – during all calls in the logs –

Does not seem to affect anything – calls connect fine both in and out and audio works as well – any ideas what this is about or how to get rid of this message?

res_srtp.c: SRTCP unprotect failed on SSRC 905329652 because of authentication failure
[2020-01-12 18:05:48] VERBOSE[22770][C-00000006] res_srtp.c: SRTCP unprotect failed on SSRC 905329652 because of authentication failure
[2020-01-12 18:05:53] VERBOSE[22770][C-00000006] res_srtp.c: SRTCP unprotect failed on SSRC 905329652 because of authentication failure
[2020-01-12 18:05:58] VERBOSE[22770][C-00000006] res_srtp.c: SRTCP unprotect failed on SSRC 905329652 because of authentication failure

thanks,

[mattf (Matthew Fredrickson)]

As I recall, this happens when Asterisk tries to unencrypt and authenticate an incoming RTCP packet and there’s a problem in that process. It can either mean packet corruption on the wire or it could indicate there’s something else that’s not right. I’m guessing you’re not seeing call problems since it’s just on the RTCP stream and not the RTP stream.

Is there anything you did that correlates with the problem starting to happen (config change, asterisk update, phone firmware update, phone config change, etc)?

[jcolp (Joshua Colp)]

If using S phones ensure they are on the latest firmware available as a fix for SRTP calls is included in it.

[hardocp]

Using a Grandstream phone and I had auto updates for firmware turned on

The problems just started a few days ago – and I believe that it may have to do with Grandstream just having released a new firmware – I did not make any other changes on the PBX so again guessing that might be the issue?

Here is the link to the new firmware http://firmware.grandstream.com/Release_Note_GXP16xx_1.0.4.152.pdf

thanks