I encountered strange issue with rtpengine: voice during a call is heard like random binary data. (Video freezes during a video call). It goes fine during 2-3 seconds before the media flow becomes glitched. It's related to SRTP calls only (RTP-SRTP, SRTP-RTP, SRTP-SRTP). RTP calls through mediaproxy are ok.

Used platform: Red Hat Linux 6.4, rtpengine (3.3.0 ?, latest form GitHub), kamailio (4.2.0-dev6) + websocket module. I have successfully installed (manually) mediaproxy daemon, Kamailio module, iptables library and kernel module. Kernel module was loaded (lsmod lists it, there are file in /proc/mediaproxy/0) and iptables were configured as expected.

Mediaproxy log looks fine except of a few suspicious messages "No support for kernel packet forwarding available". I'm not sure they are related to the mentioned problem but I would like to have working kernel support. Attached example is for SIP-to-websocket call.

rtpengine confguration is:

KERNEL=yes
TABLE=0
FALLBACK=no 
RTP_IP=10.xx.xx.xx
LISTEN_NG=127.0.0.1:2223

That would be great if you make any suggestions/comments on this issue. Need to mention that I haven't saw such problems on Debian Linux.

Couple of other questions:

- What does message "Call-ID to delete not found" means?

- "x_tables" is mentioned as required in the documentation for rtpengine kernel module (xt_MEDIAPROXY). Seems to be for Debian only. Is it required for other distros?

with best regards,
Alexey