Issue seen from beginning when using module together with Kamailio IMS. SIPp scenario tries to simulate register/unregister as seen in IMS network.
launched with: sipp -sf notify.xml -inf register.csv 192.168.55.20 -r 1 -m 1 -default_behaviors none
[notify.csv.txt](https://github.com/kamailio/kamailio/files/2155708/notify.csv.txt)
[notify.xml.txt](https://github.com/kamailio/kamailio/files/2155714/notify.xml.txt)