Mine

Index: chan_sip.c
===================================================================
--- chan_sip.c  (revision 2262)
+++ chan_sip.c  (working copy)
@@ -16596,8 +16596,17 @@
     /* we'll issue the redirect message here */
     if (!host)
     {
+
         char *localtmp;
+        char data[256];
+       char *scan;

+      if (!opbx_db_get("SIP/Registry", extension, data, sizeof(data))) {
+           scan = data;
+           host = strsep(&scan, ":");
+           port = strsep(&scan, ":");
+      } else {
+
         opbx_copy_string(tmp, get_header(&p->initreq, "To"), sizeof(tmp));
         if (!strlen(tmp))
         {
@@ -16635,6 +16644,7 @@
                 }
             }
         }
+      } // else If the device is not registered
     }

     snprintf(p->our_contact, sizeof(p->our_contact), "Transfer <sip:%s@%s%s%s>", extension, host, port ? ":" : "", port ? port : "");
-------------------- CUT HERE