[OpenSIPS-Users] sip_trace causes retransmissions

Bogdan-Andrei Iancu bogdan at opensips.org
Tue Apr 3 12:45:20 EDT 2018

Hi Schneur,

It sounds like the HEP communication becomes a bootleneck for your 
OpenSIPS... What OpenSIPS version do you use ? have you tried to run the 
followings when it gets into the "blocked"state:
     - netstat -tnp | grep opensips
     - opensipsctl trap

Best regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
OpenSIPS Summit 2018

On 03/26/2018 02:38 PM, Schneur Rosenberg wrote:
> Hi, I've realized that some of my packets get ignored after OpenSIPS
> runs for a while, I tried a stress test with SIPp without any
> configuration basically sending an invite, the server responding with
> a 407 Proxy Authentication Required and the SIPp responds with a ACK,
> once I reached 1500 calls per second it started having
> re-transmissions, but moving it back down even to one call per second
> did not solve the issue the re-transmissions kept on happening only a
> restart of OpenSIPS helped.
> I suspected its related to Homer so I removed the sip_trace command
> and restarted OpenSIPS  and only after hitting approx 3500 cps did the
> re-transmissions, but as soon as I lowered it back a little everything
> was back to usual.
> The problem also happens after the system runs for a while with very
> low call volume, this and the fact that it does not get corrected
> after lowering the stress makes me believe its a memory leak.
> How can I check whats causing it, would a "opensipsctl fifo
> get_statistics all" reveal if it is, I don't know how to read it.
> Scot (Schneur) Rosenberg
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