<div dir="auto"><span style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small">Hi ,</span><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">I have configured kamailio as an IMS server as VM based .</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">PCSCF - 10.x.x.179</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">ICSCF - 10.x.x.79</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">SCSCF - 10.x.x.73</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">HSS - 10.x.x.75</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">I am using zoiper client for testing the call flow . The <b>registration is happening properly</b> in my both zoiper clients for hss configured users (alice and bob).</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">When i am making an <b>INVITE , </b>I am getting <b>403 Forbidden - Domain not served </b>error from SCSCF.</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">The Call Flow for invite is as follows . call from <a href="mailto:alice@sip.example.com" style="text-decoration-line:none;color:rgb(66,133,244)">alice@sip.example.com</a></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">zoiper1 (UE) -> PCSCF ( INVITE <a href="mailto:sip%3Abob@sip.example.com" style="text-decoration-line:none;color:rgb(66,133,244)">sip:bob@sip.example.com</a>;transport=UDP )</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">PCSCF -> SCSCF (  INVITE <a href="mailto:sip%3Abob@sip.example.com" style="text-decoration-line:none;color:rgb(66,133,244)">sip:bob@sip.example.com</a>;transport=UDP )</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">SCSCF -> PCSCF (100 trying)</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">SCSCF -> ICSCF   ( INVITE <a href="mailto:sip%3Abob@sip.example.com" style="text-decoration-line:none;color:rgb(66,133,244)">sip:bob@sip.example.com</a>;transport=UDP )</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">ICSCF -> SCSCF (100 trying)</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">ICSCF -> SCSCF ( INVITE <a href="mailto:sip%3Abob@sip.example.com" style="text-decoration-line:none;color:rgb(66,133,244)">sip:bob@sip.example.com</a>;transport=UDP )</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">SCSCF -> ICSCF (100 trying)</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">SCSCF -> ICSCF (<b>403 Forbidden - Domain not served</b>)</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">ICSCF -> SCSCF (Request: ACK <a href="mailto:sip%3Abob@sip.example.com" style="text-decoration-line:none;color:rgb(66,133,244)">sip:bob@sip.example.com</a> | )</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">ICSCF -> SCSCF ( 403 Forbidden - Domain not served )</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">SCSCF -> PCSCF ( 403 Forbidden - Domain not served )</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">PCSCF -> UE ( 403 Forbidden - Domain not served )</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">Below are the alias configuration i have done in pcscf,icscf,scscf nodes</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><b>PCSCF.CFG</b></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"># IP-Adress for incoming SIP-Traffic, in the following format:<br><br># SIP / UDP<br>listen=udp:10.x.x.179:4060<br># SIP / TCP<br>listen=tcp:10.x.x.179:4060<br># SIP / TCP/TLS<br>listen=tls:10.x.x.179:4060<br><br># IPSEC / UDP<br>#!define IPSEC_LISTEN_ADDR "0.0.0.0"<br>#!define IPSEC_CLIENT_PORT 5062<br>#!define IPSEC_SERVER_PORT 5063<br>#alias="<a href="http://sip.example.com:4060/" style="text-decoration-line:none;color:rgb(66,133,244)">sip.example.com:4060</a>"<br>alias=<a href="http://pcscf.sip.example.com:4060/" style="text-decoration-line:none;color:rgb(66,133,244)">pcscf.sip.example.com:4060</a><br><br>#!define MY_WS_PORT 80<br>#!define MY_WSS_PORT 443<br><br>#!define PCSCF_URL "sip:<a href="http://pcscf.sip.example.com:4060/" style="text-decoration-line:none;color:rgb(66,133,244)">pcscf.sip.example.com:4060</a>"<br><br>#!define TCP_PROCESSES 8<br><br>#!subst "/NETWORKNAME/<a href="http://sip.example.com/" style="text-decoration-line:none;color:rgb(66,133,244)">sip.example.com/</a>"<br>#!subst "/HOSTNAME/<a href="http://pcscf.sip.example.com/" style="text-decoration-line:none;color:rgb(66,133,244)">pcscf.sip.example.com/</a>"<br><b><br></b></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><b>ICSCF.CFG</b></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><b><br></b></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"># SIP / UDP<br>listen=udp:10.x.x.79:4070<br># SIP / TCP<br>listen=tcp:10.x.x.79:4070<br># SIP / TCP/TLS<br>listen=tls:10.x.x.79:4071<br><br>alias="<a href="http://icscf.sip.example.com:4070/" style="text-decoration-line:none;color:rgb(66,133,244)">icscf.sip.example.com:4070</a>"<br><br>#!define NETWORKNAME "<a href="http://sip.example.com/" style="text-decoration-line:none;color:rgb(66,133,244)">sip.example.com</a>"<br>#!define HOSTNAME "<a href="http://icscf.sip.example.com/" style="text-decoration-line:none;color:rgb(66,133,244)">icscf.sip.example.com</a>"<br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><b>SCSCF.CFG</b><br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"># SIP / UDP<br>listen=udp:10.x.x.73:4080<br># SIP / TCP<br>listen=tcp:10.x.x.73:4080<br># SIP / TCP/TLS<br>listen=tls:10.x.x.73:4081<br><br>#!define NETWORKNAME "<a href="http://sip.example.com/" style="text-decoration-line:none;color:rgb(66,133,244)">sip.example.com</a>"<br>#!define HOSTNAME "<a href="http://scscf.sip.example.com/" style="text-decoration-line:none;color:rgb(66,133,244)">scscf.sip.example.com</a>"<br>#!define URI "sip:<a href="http://scscf.sip.example.com:4080/" style="text-decoration-line:none;color:rgb(66,133,244)">scscf.sip.example.com:4080</a>"<br>alias=<a href="http://scscf.sip.example.com:4080/" style="text-decoration-line:none;color:rgb(66,133,244)">scscf.sip.example.com:4080</a><br><br># ENUM-Server to query:<br>#!define ENUM_SUFFIX "<a href="http://scscf.sip.example.com/" style="text-decoration-line:none;color:rgb(66,133,244)">scscf.sip.example.com</a>."<br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto"><br></div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">Kindly let me know where i am missing . Kindly need help in this issue since the registration is happening successfully and dropping in the INVITE level.</div><div style="color:rgb(34,34,34);font-family:arial,helvetica,sans-serif;font-size:small" dir="auto">Kindly help.</div></div>