comment out optional Require header from re-invites for the sake of interop with testy t.38 terminals

libs/sofia-sip/libsofia-sip-ua/nua/nua_session.c

@@ -4486,14 +4486,13 @@ session_timer_add_headers(struct session_timer *t,
     return 1;
 
   sip_add_tl(msg, sip,
-	     TAG_IF(expires != 0, SIPTAG_SESSION_EXPIRES(x)),
-	     TAG_IF(min != 0
-		    /* Min-SE: 0 is optional with initial INVITE */
-		    || !initial,
-		    SIPTAG_MIN_SE(min_se)),
-	     TAG_IF(refresher == nua_remote_refresher && expires != 0,
-		    SIPTAG_REQUIRE_STR("timer")),
-	     TAG_END());
+			 TAG_IF(expires != 0, SIPTAG_SESSION_EXPIRES(x)),
+			 TAG_IF(min != 0
+					/* Min-SE: 0 is optional with initial INVITE */
+					|| !initial,
+					SIPTAG_MIN_SE(min_se)),
+			 //TAG_IF(refresher == nua_remote_refresher && expires != 0, SIPTAG_REQUIRE_STR("timer")),
+			 TAG_END());
 
   return 1;
 }