[Freeswitch-users] NOTIFYs seem unreliable under high number of SUBSCRIBEs

Christian Berger christian.berger at foncloud.net
Tue Mar 2 16:33:52 UTC 2021


we are currently seeing some strange behavior under load conditions. 
Notifications for calls are sent to seemingly random subsets of 
subscribed users. This already happens with the default configuration.
To recreate this we have created 10000 SUBSCRIBEs with sipp for 1002.
sipp -sf sip.xml $ip_of_freeswitch -m 10000 -r 100

Meanwhile sngrep is running to record the dialogues, and we have 2 
telephones registered to 1001 and 1002. When 1002 calls 1001, NOTIFYs 
will be sent out to the subscriptions. However when there are 10000 
subscriptions only about 3000-4000 of them will get the NOTIFY. Trying 
it again will cause another subset of the SUBSCRIBEs to be answered with 

This test was conducted locally on an otherwise idle server, so network 
loss can be ruled out rather well.

Has anybody else had a similar experience? I couldn't find any way 
sending out NOTIFYs could be limited and the number of NOTIFYs we get 
seems to be to random for such a limit.

Thank you very much for your time
    Christian Berger foncloud.net

Christian Berger


foncloud GmbH & Co KG
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