Hi, My Service Provider (Wateen) provides SIP connections. I can use my SIP phone through any softphone (e.g., Xlite). When I try to configure 3CX to use Wateen as outbound call Provider I get authentication problem. Wateen requires an "authorized username" field with the syntax email@example.com. Wateen is also using a proxy host with port 9060. When I configure 3CX without much customization, I get following errors when I dial an outbound number from my local extension: 16:42:01.780 [CM503008]: Call(67): Call is terminated 16:42:01.749 [CM503015]: Call(67): Attempt to reach <sip:firstname.lastname@example.org> failed. Reason: Forbidden 16:42:01.749 [CM503003]: Call(67): Call to sip:email@example.com:9060 has failed; Cause: 403 Forbidden; from IP:220.127.116.11:9060 16:42:01.546 [MS210006] C:67.2:Offer provided. Connection(by pass mode): 192.168.0.249:8334(8335) 16:42:01.515 [CM503004]: Call(67): Calling: VoIPline:03004007776@(Ln.@wateen)@[Dev:sip:firstname.lastname@example.org:9060] 16:42:01.452 [CM503010]: Making route(s) to <sip:email@example.com> 16:42:01.452 [MS210000] C:67.1:Offer received. RTP connection: 192.168.0.249:8334(8335) 16:42:01.452 Remote SDP is set for legC:67.1 16:42:01.452 [CM505001]: Ext.6001: Device info: Device Identified: [Man: Counterpath;Mod: eyeBeam;Rev: General] Capabilities:[reinvite, no-replaces, unable-no-sdp, recvonly] UserAgent: [eyeBeam release 3007n stamp 17816] Transport: [sip:192.168.0.242:9060] 16:42:01.405 [CM503001]: Call(67): Incoming call from Ext.6001 to <sip:firstname.lastname@example.org> 16:42:01.358 [CM500002]: Info on incoming INVITE: INVITE sip:email@example.com SIP/2.0 Via: SIP/2.0/UDP 192.168.0.249:8235;branch=z9hG4bK-d87543-666912821-1--d87543-;rport=8235 Max-Forwards: 70 Contact: <sip:firstname.lastname@example.org:8235> To: <sip:email@example.com> From: "6001"<sip:firstname.lastname@example.org>;tag=8b5b0200 Call-ID: 1220b658c50fd302 CSeq: 2 INVITE Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO Proxy-Authorization: Digest username="6001",realm="3CXPhoneSystem",nonce="12877011721:cc47b1ab75b040c801e2f967205ee18a",uri="sip:email@example.com",response="ca428769cbebe3c478eb712f18c77eb9",algorithm=MD5 User-Agent: eyeBeam release 3007n stamp 17816 Content-Length: 0 Help will be highly appreciated.