Is there anyone on this forum used Goip4 as PSTN Gateway on 3cx phone system? Our clients have 2 sim cards (different network - Smart and Globe) that is set in Goip4. Number with prefixes 0905,0906,0915,0916,0917,0926,0927 should use Globe sim card; and number with prefixes 0907,0908,0909,0910,0912,0918,0919,0920,0921,0928, 0929 should be routed to Smart sim card. The problem is we can't figure out how to setup the Goip4. I've watched the tutorial for Gempro and 3cx phone system, http://www.youtube.com/watch?v=6W6i_OLozDs The tutorial is about adding GOIP twice with different port (5060 and 5062). It works on routing the CALL IN (GOIP to 3cx), we can separate incoming calls for globe and smart to different extension. But we have an error on CALL OUT(3cx to GOIP). It registers but can't make a call. "Call or Registration to 09178178293@(Ln.10009@GOIP Globe) has failed. [ V4 192.168.3.8:5060 UDP target domain=unspecified mFlowKey=784 ] replied: 488 Not Acceptable Here; from IP:192.168.3.8:5060" When we set the GOIP as TRUNK Gateway mode, Call in and out works, but it will only use one port on 3cx. It means we can't separate the calls via prefixes. It will use the available sim when making a call.