Interesting points. In this case though. here is why I don't think its an AWS network limit:

1)This instance was in staging and had almost no traffic at that time. Why would a PPS limit have been hit?

2) The capture is taken directly on the kamailio box. If a network limit were reached the packet would be delayed across "the wire" which would only be visible in a capture on the far side. Here we see the delay locally on the box.

On Thu, May 3, 2018 at 10:19 AM, Alex Balashov <abalashov@evaristesys.com> wrote:

PS. A good rule of thumb is that AWS has undisclosed and semi-disclosed (and rather low) network iop and PPS limits EVERYWHERE, including on instances whose specs are otherwise sufficient for the job. If in doubt, try a bigger instance.

-- Alex

--
Sent via mobile, please forgive typos and brevity.

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