[Freeswitch-users] Problem with rtp streams and stair-stepped (or ramped) increased lag

[Nathan Neulinger]

In one particular stream, which is  call mgr <-> FS, the CCM to freeswitch side of the stream shows no issues, but 
freeswitch to CCM direction shows a number of drifts, some just one ptime worth, others larger.

This instance is running as a VM, but allocated significantly more reserved cpu (and very high shares) on a lightly 
loaded host. Concurrent calls on the FS instance is in the single digits at most at this point. Typical end to end 
network induced latencies less than 3 ms at most.

Any suggestions on what to look at or steps to take here? Certainly not happening on every call, but I do believe I've 
seen it on both cisco and polycom phone connections. Usually, there is just a slow stairstep over the period of the call.

-- Nathan

On 06/24/2013 06:24 PM, Nathan Neulinger wrote:
> Having some occasional user reports of problem calls where they are fine, and then something happens on the call and lag
> increases significantly, sometimes up to 2+ seconds.
>
> I've got severe examples on both cisco and polycom phones. What I'm seeing looks like the call is going perfectly for a
> period of time (sometimes up to a few minutes), and then there is a period of time with higher latency packets, and the
> overall delay in the graph increases steadily at that point, and never recovers.
>
> It sounded like rtp-autoflush-during-bridge might be something relevant, but that's set to the default. Also saw
> "rtp-rewrite-timestamps", but unclear if that is necessary here.
>
> I've got pcap captures of the rtp streams if that'll help any.
>
> -- Nathan
>
> ------------------------------------------------------------
> Nathan Neulinger                       nneul at mst.edu
> Missouri S&T Information Technology    (573) 612-1412
> System Administrator - Architect
>
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-- 
------------------------------------------------------------
Nathan Neulinger                       nneul at mst.edu
Missouri S&T Information Technology    (573) 612-1412
System Administrator - Architect