--- channels/chan_sip.c (revision 24910)
+++ channels/chan_sip.c (arbetskopia)
@@ -10795,8 +10795,9 @@
                sep = strchr(tagbuf, ';');
                if (sep)
                        *sep = '\0';
+               return tagbuf;
        }
-       return tagbuf;
+       return NULL;
 }

 /*! \brief Handle incoming notifications */