I am raising a new topic for urgent help, Currently 3cx systems is working fine in my local lan which starts with ip address 192.168.2.X . but i want to implement it on android phone with different ip address starting from 192.168.100.x . Please note that i do not want allow user to use 3cx phone out of the office . I do not want to use 3cx tunnel or SBC . The system should understand both ip as local lan. The problem I am facing is , I do not get presence information over the android phone as well as it is connecting and disconnecting many times. so how do i implement it in 2 different subnets. Please help.