hi 
i m using kamailio 5.1, with -m 512 -M 8
it stop registering user SIP
anf in status it shows 

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● kamailio.service - LSB: Start the Kamailio SIP proxy server
   Loaded: loaded (/etc/init.d/kamailio; generated)
   Active: active (exited) since Sat 2019-09-07 11:05:16 UTC; 3 days ago
     Docs: man:systemd-sysv-generator(8)

Sep 11 06:38:36 talk /usr/local/sbin/kamailio[17708]: INFO: <core> [main.c:819]: sig_usr(): signal 15 received
Sep 11 06:38:36 talk /usr/local/sbin/kamailio[17677]: INFO: <core> [main.c:819]: sig_usr(): signal 15 received
Sep 11 06:38:36 talk /usr/local/sbin/kamailio[17714]: INFO: <core> [main.c:819]: sig_usr(): signal 15 received
Sep 11 06:38:36 talk /usr/local/sbin/kamailio[17685]: INFO: <core> [main.c:819]: sig_usr(): signal 15 received
Sep 11 06:38:36 talk /usr/local/sbin/kamailio[17681]: {1 1094155754 NOTIFY TwGwmzx4wINnraJs1Gh3Kg..} INFO: <core> [main.c:819]: sig_usr(): s… received
Sep 11 06:38:36 talk /usr/local/sbin/kamailio[17704]: INFO: <core> [main.c:819]: sig_usr(): signal 15 received
Sep 11 06:38:36 talk /usr/local/sbin/kamailio[17689]: INFO: <core> [main.c:819]: sig_usr(): signal 15 received
Sep 11 06:38:36 talk /usr/local/sbin/kamailio[17693]: INFO: <core> [main.c:819]: sig_usr(): signal 15 received
Sep 11 06:38:36 talk /usr/local/sbin/kamailio[17691]: INFO: <core> [main.c:819]: sig_usr(): signal 15 received
Sep 11 06:38:36 talk /usr/local/sbin/kamailio[17674]: INFO: <core> [core/sctp_core.c:53]: sctp_core_destroy(): SCTP API not initialized
Hint: Some lines were ellipsized, use -l to show in full.
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plz help  
thank you 

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Regards:
Gaurav Kumar