<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif"><font color="#000000">Yes Joshua, Its SIP and but the problem is I have tried everything but it doesn't seem to work.</font></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><font color="#000000"><br></font></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><font color="#000000">In the SIP Trace I can see that I am sending 503 Service Unavailable as a response.</font></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><font color="#000000"><br></font></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><font color="#000000">You can check the SIP trace attached below:</font></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(11,83,148)"><div id="gmail-sippath" class="gmail-sipmessage gmail-ng-binding gmail-ng-scope" style="box-sizing:border-box;white-space:pre-wrap;padding-top:10px;color:rgb(51,51,51);font-family:"helvetica neue",helvetica,roboto,arial,sans-serif;font-size:12px"><a href="http://162.243.107.173:5060">162.243.107.173:5060</a> -> <a href="http://66.226.76.70:5060">66.226.76.70:5060</a></div><div id="gmail-sipmsg" class="gmail-sipmessage gmail-ng-binding gmail-ng-scope" style="box-sizing:border-box;white-space:pre-wrap;padding-top:10px;color:rgb(51,51,51);font-family:"helvetica neue",helvetica,roboto,arial,sans-serif;font-size:12px">SIP/2.0 <font color="red" style="box-sizing:border-box"><span style="box-sizing:border-box;font-weight:700">503</span></font> Service Unavailable
Via: SIP/2.0/UDP 66.226.76.70:5060;branch=<font color="green" style="box-sizing:border-box"><span style="box-sizing:border-box;font-weight:700">z9hG4bK643.e44ea565.0</span></font>;received=66.226.76.70;rport=5060
Via: SIP/2.0/UDP 74.117.36.136;received=74.117.36.136;rport=5060;branch=z9hG4bKHBe9cmy3QX2Se
From: <<a href="http://sip:2126555763@66.226.76.70:5060">sip:2126555763@66.226.76.70:5060</a>>;tag=<font color="red" style="box-sizing:border-box"><span style="box-sizing:border-box;font-weight:700">5H54caUKre8gc</span></font>
To: <<a href="http://sip:12023300643@162.243.107.173:5060">sip:12023300643@162.243.107.173:5060</a>>;tag=as61c328a0
Call-ID: <font color="blue" style="box-sizing:border-box"><span style="box-sizing:border-box;font-weight:700">15-8824754a-f58560c9-335bcd48-45558f71</span></font>
CSeq: 103180201 INVITE
Server: user_Anas
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Content-Length: 0</div></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(11,83,148)"><br></div></div>