Just setup a SPA3102 to interface between my Vonage box and 3CX PBX. Followed your posted procedure to the letter including some very great threads regarding the "tweaking" needed to create shortest ring delay while allowing CID. Vonage now rings incoming perfectly, no complaint. Outbound calls are failing however, with log showing issues of authorization between originating extension and 3102 (I believe). System setup - 3CX alone on PC Box with Win2K Server OS using two PAP2s to run four analog extensions, vBuzzer as VoIP provider and Vonage via 3102. I have tried outbound calls from analog extensions and softphones, same results. Below is excerpt from log showing errors: 19:58:02.539 CallConf::Rejected [CM103005] Call(25) is rejected: Invalid password provided 19:58:02.539 StratInOut:nCancel [CM104008] Call(25): Call from Ext.120 to 4167433224 terminated; cause: 403 Invalid password provided; from IP:192.168.1.211 19:58:02.469 AuthMgr:nAuthFailure [CM101000] Registration request from sip:email@example.com:5060 failed. Reason: Credentials don't match, check that authorization-ID and password match the ones in extension settings 19:58:02.469 AuthMgr::requestCredential [CM001005] Message SipReq: INVITE firstname.lastname@example.org:5060 tid=3e701e51e869f817 cseq=INVITE email@example.com:5060 / 2 from(wire) failed authentication! 19:58:02.469 AuthMgr::requestCredential [CM001001] Authentication ID for CfgExt:120 doesn't match provided: 10009 vs 120 19:58:01.728 CallConf:nIncoming [CM103002] Call(25): Incoming call from 120 (Ext.120) to sip:firstname.lastname@example.org 19:57:07.790 ServRegs:nAdd [CM113002] Registered: Ext.120 In this case 120 is a softphone. This isn't a life or death situation since vBuzzer is handling outgoing in the interim but like a dog with a bone - it will drive me nuts until its done / fixed so any help would be greatly appreciated. Mirza.