Yes Joshua, Its SIP and but the problem is I have tried everything but it doesn't seem to work.
In the SIP Trace I can see that I am sending 503 Service Unavailable as a response. You can check the SIP trace attached below: 162.243.107.173:5060 -> 66.226.76.70:5060 SIP/2.0 503 Service Unavailable Via: SIP/2.0/UDP 66.226.76.70:5060;branch= z9hG4bK643.e44ea565.0;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: <sip:2126555763@66.226.76.70:5060>;tag=5H54caUKre8gc To: < sip:12023300643@162.243.107.173:5060>;tag=as61c328a0 Call-ID: 15-8824754a-f58560c9-335bcd48-45558f71 CSeq: 103180201 INVITE Server: user_Anas Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE Supported: replaces, timer Content-Length: 0
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