diff --git a/src/switch_cpp.cpp b/src/switch_cpp.cpp
index 91d0980..fc9b359 100644
--- a/src/switch_cpp.cpp
+++ b/src/switch_cpp.cpp
@@ -693,6 +693,9 @@ SWITCH_DECLARE(void) CoreSession::setDTMFCallback(void *cbfunc, char *funcargs)
 	// the callback is a function pointer with a specific signature.
 	// so, set it to the following c function which will act as a proxy,
 	// finding the python callback in the args callback args structure
+
+	switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "ASSIGN INPUT CALLBACK %p\n", (void *) dtmf_callback);
+
 	args.input_callback = dtmf_callback;  
 	ap = &args;
 
@@ -1267,6 +1270,9 @@ SWITCH_DECLARE(void) bridge(CoreSession &session_a, CoreSession &session_b)
 				args = session_a.get_cb_args();  // get the cb_args data structure for session a
 				dtmf_func = args.input_callback;   // get the call back function
 				err = NULL;
+
+				switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session_a.session), SWITCH_LOG_CRIT, "BRIDGE input callback func: %p\n", (void *)dtmf_func);
+
 				switch_ivr_multi_threaded_bridge(session_a.session, session_b.session, dtmf_func, args.buf, args.buf);
 			}
 			session_a.end_allow_threads();