Why my 3CX outgoing call port does not match gateway port? I'm using latest 3CX version and Grandstream GXW4108 FXO with the same firmware described in tutorials. When making calls with 3CX, the ports/trunks status shows: Status: Connected Virtual Ext. # 10002 While in gateway status page, I see: Line 4: busy, PSTN Outgoing (dialed#): 1111111111 Shouldn't be virtual ext 10002 -> Line/channel 2 instead of line 4 ??? In GrandStream channel settings: Channel 2: SIP User ID: 10002, Authenticate ID 10002 ... Channel 4: SIP User ID: 10004, Authenticate ID 10004 All trunks are idle, so there is no reason to round-robin in GrandStream, right? Incoming calls connects the trunk with it's repective virtual extension. Thanks for any help!