Browser-Phone icon indicating copy to clipboard operation
Browser-Phone copied to clipboard

Published 20 hours ago • verified publisher icon InnovateAsterisk

Getting Warning related to SRTP

Open deepaksharma9899 opened this issue 1 year ago • 3 comments

I am getting this warning repeatedly "res_srtp.c:508 ast_srtp_protect: SRTP protect: replay check failed (index too old)" when this warning appears, the video stops working.

Thanks,

deepaksharma9899 avatar Jul 13 '23 07:07 deepaksharma9899

https://community.asterisk.org/t/srtp-protect-replay-check-failed-index-too-old/94174/22

I have raised this issue before, but as you can see in the thread it wasn’t resolved. Asterisk development and Chrome development don’t always align-especially with WebRTC matters.

InnovateAsterisk avatar Jul 13 '23 08:07 InnovateAsterisk

So, will it run on other browsers like edge or Firefox, without getting this warning?

Thanks.

deepaksharma9899 avatar Jul 13 '23 09:07 deepaksharma9899

Firefox maybe, but Edge is actually just Chrome (re-skinned).

What would be best is for Asterisk and Browsers to be able to correctly handle this protocol/feature. Or for this protocol/feature to be able to be disabled in Asterisk.

The “protocol/feature” is that a lost RTP packet can be given a buffer to be resent if it was dropped. It appears asterisk added support for this, but no way to disable it.

From what I found: The error you are seeing is the result of Asterisk expecting to be resent a packet it has re-asked for. (Hence the “index too old” message).

I was not able to solve this issue any further, and It doesn’t happen with audio calls. My end-user development focus has moved to more peer-to-peer approach that is not subject to this problem.

InnovateAsterisk avatar Jul 13 '23 12:07 InnovateAsterisk