I want to forward incomming sip calls to PSTN through voip provider which I already configured for extension 100, but when I am trying to contact ext 100, getting status below and unable to connect. Server Status: 13:29:43.406 Incoming c5 "101"<sip:firstname.lastname@example.org:5061> <sip:email@example.com> Incoming call (before routing) 13:29:43.437 Destination Ext:100 has been found for Ext:101, but it hasn't been registered! Unable to complete call. 13:29:43.437 Rejected c5 "101"<sip:firstname.lastname@example.org:5061> <sip:email@example.com> Call destination cannot be resolved 13:29:43.437 Terminated c5 "101"<sip:firstname.lastname@example.org:5061> <sip:email@example.com> Call ended Also as I know, no need to conifure any softphone or voip phone for ext 100, because i am using ext 100 with voip provider, so when other extension will dial ext 100 their call will connect to PSTN No. through configured VOIP Provider. Am I right ? If No, please give me some details how my sip calls will forward to PSTN through VOIP Provider, I dont want to use any physical devide or phone.