I cannot configure ZoiPer to connect to my local PBX (Asterisk with FreePBX). I give the IP-Address, the username/password and the port, but on that local machine nothing is coming on. No firewall between. With wireshark I cannot see anything.
I can use another app, eg. CSipSimple und configure my local PBX without any problem.
Android 6.0.1 on Samsung Note 4.