Hi Outstanding issues to be helped: 1. When using esl to call Freeswitch's app(sofia_contact), cps was between 1 to 2, Freeswitch was leading to deadlock. 2. Also, when using lua to manage SIP register instead of xml, when Sofia_contact was using in Dial-striing, it also led to Freeswitch deadlock. You can search "loac_wait" in the attached Freeswitch thread to find deadlock Null. Thanks a lot!