Hi mates, Everytime i do try to make my 2 xlite clients talk (which i correctly added them into the database), i encountered with the same problm, Openser perfoms authentication and return call failed 403 forbiden signal. My setup comprise of the first box with openser 1.3 and mediaproxy the second box with Mysql and two Xlite clients in two other boxes all are in an internal network, as far as am concerned my NetAdmin have already opened ports 5060 and 3306 for me. I need your right direction on this probm. below is my ngrep snapshot mzee:/# ngrep -d eth1 -W byline port 5060 interface: eth1 (168.172.200.0/255.255.255.0) filter: (ip or ip6) and ( port 5060 ) # U 168.172.200.70:1824 -> 168.172.200.87:5060 INVITE sip:musketeerm@168.172.200.87 &lt;sip%3Amusketeerm(a)168.172.200.87&gt;SIP/2.0IP/2.0. Via: SIP/2.0/UDP 168.172.200.70:1824 ;branch=z9hG4bK-d87543-ef08fb62b30f1a54-1--d87543-. Max-Forwards: 70. Contact: <sip:dreamteam@168.172.200.70:1824>. To: "musk"<sip:musketeerm@168.172.200.87 &lt;sip%3Amusketeerm(a)168.172.200.87&gt;&gt;7>>. From: "dream"<sip:dreamteam@168.172.200.87 &lt;sip%3Adreamteam(a)168.172.200.87&gt; Call-ID: OTAyNWJhOTdiZjBlNmUwNDYyZWI0YzdkM2JhZTUxMTU.. CSeq: 1 INVITE. Session-Expires: 95. Min-SE: 90. Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO. Content-Type: application/sdp. Supported: timer. User-Agent: X-Lite release 1011s stamp 41150. Content-Length: 426. . v=0. o=- 9 2 IN IP4 168.172.200.70. s=CounterPath X-Lite 3.0. c=IN IP4 168.172.200.70. t=0 0. m=audio 52166 RTP/AVP 107 119 100 106 0 105 98 8 101. a=alt:1 1 : uZB2dYm+ NKBRK8Ep 168.172.200.70 52166. a=fmtp:101 0-15. a=rtpmap:107 BV32/16000. a=rtpmap:119 BV32-FEC/16000. a=rtpmap:100 SPEEX/16000. a=rtpmap:106 SPEEX-FEC/16000. a=rtpmap:105 SPEEX-FEC/8000. a=rtpmap:98 iLBC/8000. a=rtpmap:101 telephone-event/8000. a=sendrecv. # U 168.172.200.87:5060 -> 168.172.200.70:1824 SIP/2.0 403 Forbidden. Via: SIP/2.0/UDP 168.172.200.70:1824 ;branch=z9hG4bK-d87543-ef08fb62b30f1a54-1--d87543-. To: "musk"<sip:musketeerm@168.172.200.87 &lt;sip%3Amusketeerm(a)168.172.200.87&gt; From: "dream"<sip:dreamteam@168.172.200.87 &lt;sip%3Adreamteam(a)168.172.200.87&gt; Call-ID: OTAyNWJhOTdiZjBlNmUwNDYyZWI0YzdkM2JhZTUxMTU.. CSeq: 1 INVITE. Server: OpenSER (1.3.0-notls (i386/linux)). Content-Length: 0. . # U 168.172.200.70:1824 -> 168.172.200.87:5060 ACK sip:musketeerm@168.172.200.87 &lt;sip%3Amusketeerm(a)168.172.200.87&gt; SIP/2.0. Via: SIP/2.0/UDP 168.172.200.70:1824 ;branch=z9hG4bK-d87543-ef08fb62b30f1a54-1--d87543-. To: "musk"<sip:musketeerm@168.172.200.87 &lt;sip%3Amusketeerm(a)168.172.200.87&gt; From: "dream"<sip:dreamteam@168.172.200.87 &lt;sip%3Adreamteam(a)168.172.200.87&gt; Call-ID: OTAyNWJhOTdiZjBlNmUwNDYyZWI0YzdkM2JhZTUxMTU.. CSeq: 1 ACK. Content-Length: 0. WBR, LU. -- Luzango Mfupe TUUNE MOBILE Tel:0128440528/0123825710 Tshwane-RSA