Hi there, I've the following system: 1. 3CX Phone System 2. LinkSys 3102 3. IP Phones 4. PSTN Line Everything seems to work fine. IP Phones can make calls perfectly between them. IP Phones can make calls outside without a problem using the PSTN line attached to LinkSys 3102. BUT Incoming calls coming from PSTN line are being rejected by 3CX Phone System. I get the following messages at the 3CX server: 16:47:11.740 [CM503008]: Call(44): Call is terminated 16:47:11.740 [CM502001]: Source info: From: "Linksys SPA-3102" sip:firstname.lastname@example.org>;tag=76d4748490166cb8o1<sip:email@example.com> 16:47:11.740 [CM503013]: Call(44): Incoming call rejected, caller is unknown; msg=SipReq: INVITE firstname.lastname@example.org tid=-4fd301c4 cseq=INVITE email@example.com:5061 / 102 from(wire) Where 192.168.0.200 is the 3CX IP 192.168.0.201 is the LinkSys 3102 IP 10000 is the LinkSys 3102 Virtual Extension Why is the call being rejected? Do I have to specify which callers are able to call? Where at? I've routed all the incomming calls from port 10000 to the Digital Receptionist (ext.100). Is it possible to create an Inbound Rule for all incoming calls? I've created the following one: DIDNumber: * Port Identification: 10000 Associated Port Identification: 10000 During Office Hours / Out of Office Hours: 100 (Digital Receptionist) Any idea of why is 3CX refusing the calls? Thanks a lot! Juan Bravo.