one of the providers i've been using all a sudden doesn't work properly through the 3cx. no upgrades have been done, no system changes have been completed recently. the provider is VArphonex. this is the issue; incoming calls connect through the 3cx to DR to extension just fine but after 20 or so seconds the call is disconnected. this is the message when it happens. 13:04:13.203 StratLink:nHangUp [CM104001] Call(7): Ln:10000@VAR hung up call; cause: unknown outbound calls are no problem. they complete and stay up. the service provider works properly both ways when configured with a softphone. this is a call log of a failure. 13:16:13.343 StratLink:nHangUp [CM104001] Call(8): Ln:10000@VAR hung up call; cause: unknown 13:15:54.765 CallLegImpl:nConnected [CM103001] Call(8): Created audio channel for Ext.1100 (192.168.2.253:8186) with Media Server (192.168.2.1:7008) 13:15:54.765 StratInOut:nConnected [CM104005] Call(8): Setup completed for call from Ln:10000@VAR to Ext.1100 13:15:54.125 CallConf:nProvisional [CM103003] Call(8): Ext.1100 is ringing 13:15:50.312 MediaServerReporting:TMFhandler [MS211000] Call(8) Ln:10000@VAR: DTMF (RTP) from 220.127.116.11:59162 arrived. in-band DTMF tone detection is turned off. 13:15:41.250 CallLegImpl:nConnected [CM103001] Call(8): Created audio channel for Ln:10000@VAR (18.104.22.168:59162) with Media Server (my.public.ip:9008) 13:15:41.234 CallConf:nIncoming [CM103002] Call(8): Incoming call from 954585xxxx (Ln:10000@VAR) to sip:email@example.com varphonex support isn't any help. does any have a clue what the issue.