Thousands of Warnings

I am getting thousands of the following warnings in my system while watching the CLI

[2015-11-03 11:32:25] WARNING[5873][C-00000358]: chan_sip.c:7312 sip_write: Can’t send 10 type frames with SIP write


As explained by Shaun Ruffell from Digium, type 10 is a CNG (Comfort Noise Generation):

Frame type ‘10’ is a CNG (Comfort Noise Generation) frame. This is a
frame that, instead of carrying audio, carries a command for the
receiver to generate “comfort noise” for a length of time to the
local user.

chan_dahdi is not currently capable of generating comfort noise in
response to receiving one of these frames.

I think it’s safe to ignore them. Alternatively, if the comfort
noise packets are generated from SIP endpoints that you have control
over, you could see if there are any options to disable generation
of those frames.

Shaun Ruffell
Digium, Inc. | Linux Kernel Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at: &

So, my suggestion is cancel CNG on all of your endpoints and ask your telco providers as well to cancel the CNG on your trunks.

Thank you,

Daniel Friedman
Trixton LTD.