Yes Mike, net.userdir.plugins setting is already there.
Please find the configuration given below.
net.userdir.plugins=com.domain.proxy.plugins.SampleUserDir

Thanks for the reply, I could see the following module loaded as auth plugin registrar: start registrar: cache: alloc-size=2000 registrar: plugin=com.brekeke.sipadmin.plugins.RegisteredSqlDB : loaded registrar: keepaliver=com.brekeke.net.sip.sv.registrar.keepalive.KeepAliverDatabase : loaded ...

1. Brekeke Product Name and Version: Brekeke SIP Server, Version 3.7.7.3, Evaluation 2. Java version: 1.8.0_111 3. OS type and the version: 14.04.1-Ubuntu 4. UA (phone), gateway or other hardware/software involved: Ciscosx20 5. Your problem: I am using Brekeke SIP server and configured third party ...