<div dir="ltr"><div><div><div><div><div><div><div>Hi, <br><br></div>I have a problem with the SIP message REFER. <br></div>I initiate a conference by entering into a conference room, and then I want Freeswitch to add a new participant. <br></div>According to the RFC 4579, I sent a REFER message to Freeswitch to add the new participant and I get back a NOTIFY with sipfrag 403 forbidden <br><br></div>I&#39;m working with virtual IP adresses and I&#39;m working only in local <br><br></div>Below is the REFER message I send <br><br>REFER <a href="http://sip:3000@192.168.20.3:6060">sip:3000@192.168.20.3:6060</a> SIP/2.0<br>Via: SIP/2.0/UDP 192.168.20.4:7000;branch=z9hG4bKg4534<br>Max-Forwards: 70<br>To: &lt;<a href="http://sip:3000@192.168.20.3:6060">sip:3000@192.168.20.3:6060</a>&gt;;isfocus<br>From: &lt;<a href="http://sip:1000@192.168.20.4:7000">sip:1000@192.168.20.4:7000</a>&gt;;tag=1832665346<br>Call-ID: jbDaf1W7hQtswyvf<br>CSeq: 1 REFER<br>Contact: &lt;<a href="http://sip:1000@192.168.20.4:7000">sip:1000@192.168.20.4:7000</a>&gt;<br>Allow: INVITE,BYE,REGISTER,ACK,OPTIONS,CANCEL,INFO,PRACK,REFER,MESSAGE,PUBLISH<br>Allow-Events: REFER<br>Accept: application/sdp, message/sipfrag<br>Refer-To: &lt;sip:1001@192.168.20.3:5031;method=INVITE&gt;<br>Supported: timer, replaces, path<br>Content-Length: 0<br><br><br></div>and here is the siptrace of FS<br><br>recv 466 bytes from udp/[192.168.20.3]:7000 at 13:21:45.621109:<br>   ------------------------------------------------------------------------<br>   REFER <a href="http://sip:3000@192.168.20.3:6060">sip:3000@192.168.20.3:6060</a> SIP/2.0<br>   Via: SIP/2.0/UDP 192.168.20.3:7000;rport;branch=z9hG4bKg4534<br>   Max-Forwards: 70<br>   To: &lt;<a href="http://sip:3000@192.168.20.3:6060">sip:3000@192.168.20.3:6060</a>&gt;;isfocus;tag=g2y4Btme55Fje<br>   From: &lt;<a href="http://sip:1000@192.168.20.3:7000">sip:1000@192.168.20.3:7000</a>&gt;;tag=1832665346<br>   Call-ID: jbDaf1W7hQtswyvf<br>   CSeq: 476 REFER<br>   Contact: &lt;<a href="http://sip:1000@192.168.20.3:7000">sip:1000@192.168.20.3:7000</a>&gt;<br>   Allow: INVITE,BYE,REGISTER,ACK,OPTIONS,CANCEL,INFO,PRACK,REFER,MESSAGE,PUBLISH<br>   Refer-To: &lt;<a href="http://sip:1001@192.168.20.3:5001">sip:1001@192.168.20.3:5001</a>&gt;<br>   Supported: replaces<br>   Content-Length: 0<br>   <br>   ------------------------------------------------------------------------<br>2015-08-07 13:21:45.615060 [DEBUG] switch_core_session.c:1061 Send signal sofia/internal/<a href="mailto:1000@192.168.20.3">1000@192.168.20.3</a> [BREAK]<br>2015-08-07 13:21:45.615060 [DEBUG] switch_core_session.c:978 Send signal sofia/internal/<a href="mailto:1000@192.168.20.3">1000@192.168.20.3</a> [BREAK]<br>2015-08-07 13:21:45.615060 [DEBUG] sofia.c:7799 Process REFER to [<a href="mailto:1001@192.168.20.3">1001@192.168.20.3</a>]<br>send 722 bytes to udp/[192.168.20.3]:7000 at 13:21:45.624429:<br>   ------------------------------------------------------------------------<br>   SIP/2.0 202 Accepted<br>   Via: SIP/2.0/UDP 192.168.20.3:7000;rport=7000;branch=z9hG4bKg4534<br>   From: &lt;<a href="http://sip:1000@192.168.20.3:7000">sip:1000@192.168.20.3:7000</a>&gt;;tag=1832665346<br>   To: &lt;<a href="http://sip:3000@192.168.20.3:6060">sip:3000@192.168.20.3:6060</a>&gt;;isfocus;tag=g2y4Btme55Fje<br>   Call-ID: jbDaf1W7hQtswyvf<br>   CSeq: 476 REFER<br>   Contact: &lt;sip:3000@192.168.20.3:6060;transport=udp&gt;<br>   Expires: 60<br>   User-Agent: FreeSWITCH-mod_sofia/1.4.20+git~20150701T115426Z~0ae8ee7f8f~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE<br>   Supported: timer, path, replaces<br>   Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer<br>   Content-Length: 0<br>   <br>   ------------------------------------------------------------------------<br>2015-08-07 13:21:45.615060 [ERR] sofia.c:8297 Cannot Blind Transfer 1 Legged calls<br>send 888 bytes to udp/[192.168.20.3]:7000 at 13:21:45.624580:<br>   ------------------------------------------------------------------------<br>   NOTIFY <a href="http://sip:1000@192.168.20.3:7000">sip:1000@192.168.20.3:7000</a> SIP/2.0<br>   Via: SIP/2.0/UDP 192.168.20.3:6060;rport;branch=z9hG4bKgNeKBK5H869jQ<br>   Max-Forwards: 70<br>   From: &lt;<a href="mailto:sip%3A3000@192.168.20.3">sip:3000@192.168.20.3</a>&gt;;isfocus;tag=g2y4Btme55Fje<br>   To: &lt;<a href="mailto:sip%3A1000@192.168.20.3">sip:1000@192.168.20.3</a>&gt;;tag=1832665346<br>   Call-ID: jbDaf1W7hQtswyvf<br>   CSeq: 79137188 NOTIFY<br>   Contact: &lt;sip:3000@192.168.20.3:6060;transport=udp&gt;<br>   User-Agent: FreeSWITCH-mod_sofia/1.4.20+git~20150701T115426Z~0ae8ee7f8f~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE<br>   Supported: timer, path, replaces<br>   Event: refer;id=476<br>   Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer<br>   Subscription-State: terminated;reason=noresource<br>   Content-Type: message/sipfrag;version=2.0<br>   Content-Length: 23<br>   <br>   SIP/2.0 403 Forbidden<br>   ------------------------------------------------------------------------<br>send 888 bytes to udp/[192.168.20.3]:7000 at 13:21:46.625031:<br>   ------------------------------------------------------------------------<br>   NOTIFY <a href="http://sip:1000@192.168.20.3:7000">sip:1000@192.168.20.3:7000</a> SIP/2.0<br>   Via: SIP/2.0/UDP 192.168.20.3:6060;rport;branch=z9hG4bKgNeKBK5H869jQ<br>   Max-Forwards: 70<br>   From: &lt;<a href="mailto:sip%3A3000@192.168.20.3">sip:3000@192.168.20.3</a>&gt;;isfocus;tag=g2y4Btme55Fje<br>   To: &lt;<a href="mailto:sip%3A1000@192.168.20.3">sip:1000@192.168.20.3</a>&gt;;tag=1832665346<br>   Call-ID: jbDaf1W7hQtswyvf<br>   CSeq: 79137188 NOTIFY<br>   Contact: &lt;sip:3000@192.168.20.3:6060;transport=udp&gt;<br>   User-Agent: FreeSWITCH-mod_sofia/1.4.20+git~20150701T115426Z~0ae8ee7f8f~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE<br>   Supported: timer, path, replaces<br>   Event: refer;id=476<br>   Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer<br>   Subscription-State: terminated;reason=noresource<br>   Content-Type: message/sipfrag;version=2.0<br>   Content-Length: 23<br>   <br>   SIP/2.0 403 Forbidden<br>   ------------------------------------------------------------------------<br>send 888 bytes to udp/[192.168.20.3]:7000 at 13:21:48.626014:<br>   ------------------------------------------------------------------------<br>   NOTIFY <a href="http://sip:1000@192.168.20.3:7000">sip:1000@192.168.20.3:7000</a> SIP/2.0<br>   Via: SIP/2.0/UDP 192.168.20.3:6060;rport;branch=z9hG4bKgNeKBK5H869jQ<br>   Max-Forwards: 70<br>   From: &lt;<a href="mailto:sip%3A3000@192.168.20.3">sip:3000@192.168.20.3</a>&gt;;isfocus;tag=g2y4Btme55Fje<br>   To: &lt;<a href="mailto:sip%3A1000@192.168.20.3">sip:1000@192.168.20.3</a>&gt;;tag=1832665346<br>   Call-ID: jbDaf1W7hQtswyvf<br>   CSeq: 79137188 NOTIFY<br>   Contact: &lt;sip:3000@192.168.20.3:6060;transport=udp&gt;<br>   User-Agent: FreeSWITCH-mod_sofia/1.4.20+git~20150701T115426Z~0ae8ee7f8f~64bit<br>   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE<br>   Supported: timer, path, replaces<br>   Event: refer;id=476<br>   Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer<br>   Subscription-State: terminated;reason=noresource<br>   Content-Type: message/sipfrag;version=2.0<br>   Content-Length: 23<br>   <br>   SIP/2.0 403 Forbidden<br><br><br></div>Thanks for your help.<br><div><br><br></div></div>