Hi all, I'm new, and the follwing it's my first installation of 3CX: 3CKX phoneSystem 8 + 3CXPhone 4 (10): both installed on the same machine (192.168.1.101). Another 3CXPhone 4 on different machine behaves in the same way. I'm able to receive and to do outbound calls. The only one problem is that if I start an outbound call from 3CXPhone 4 and than I drop the call on the 3CXPhone 4, the called number phone continues ringing. After that (while the called number is ringing) PBX sees a free line: I'm able to call the same number: it is busy ! right. Coud this problem depend on the configuration of me sip provider? this is the log: 15:37:43.932 [MS105000] C:4.1: No RTP packets were received:remoteAddr=127.0.0.1:40006,extAddr=0.0.0.0:0,localAddr=127.0.0.1:16388 15:37:43.761 [CM503008]: Call(4): Call is terminated 15:37:30.262 [CM505003]: Provider:[TG] Device info: Device Not Identified: User Agent not matched; Capabilities:[reinvite, replaces, able-no-sdp, recvonly] UserAgent: [IPKOM VCUBE 3.2r15] PBX contact: [sip:SipAccountNum@publicIp:1411] 15:37:30.262 [CM503002]: Call(4): Alerting sip:SipAccountNum@SIP_PROXY:5060 15:37:30.022 [CM503025]: Call(4): Calling VoIPline:NumChiamato@(Ln.10002@TG)@[Dev:sip:SipAccountNum@SIP_PROXY:5060] 15:37:29.861 [CM503004]: Call(4): Route 1: VoIPline:NumChiamato@(Ln.10002@TG)@[Dev:sip:SipAccountNum@SIP_PROXY:5060] 15:37:29.851 [CM503010]: Making route(s) to <sip:NumChiamato@192.168.1.101:5060> 15:37:29.851 [CM505001]: Ext.10: Device info: Device Identified: [Man: 3CX Ltd.;Mod: 3CXVoipPhone;Rev: General] Capabilities:[reinvite, replaces, able-no-sdp, recvonly] UserAgent: [3CXVoipPhone 4.0.9878.0] PBX contact: [sip:email@example.com:5060] 15:37:29.831 [CM503001]: Call(4): Incoming call from Ext.10 to <sip:NumChiamato@192.168.1.101:5060> can you help me? could you suggest to me do other attempts to discover the reason? Thank you PS: 3CXPhone 4 registered directly to he same sip provider works fine!