More ticket #399: added PJSUA API to retrieve the remote NAT type

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@1533 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjsip/include/pjsua-lib/pjsua_internal.h b/pjsip/include/pjsua-lib/pjsua_internal.h
index 530dc89..004c1ca 100644
--- a/pjsip/include/pjsua-lib/pjsua_internal.h
+++ b/pjsip/include/pjsua-lib/pjsua_internal.h
@@ -52,6 +52,7 @@
     pjmedia_transport	*med_tp;    /**< Media transport.		    */
     pj_timer_entry	 refresh_tm;/**< Timer to send re-INVITE.	    */
     pj_timer_entry	 hangup_tm; /**< Timer to hangup call.		    */
+    pj_stun_nat_type	 rem_nat_type; /**< NAT type of remote endpoint.    */
 
     char    last_text_buf_[128];    /**< Buffer for last_text.		    */