Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 223369)
+++ channels/chan_sip.c	(working copy)
@@ -2087,7 +2087,8 @@
 static int transmit_response_with_t38_sdp(struct sip_pvt *p, char *msg, struct sip_request *req, int retrans);
 static struct ast_udptl *sip_get_udptl_peer(struct ast_channel *chan);
 static int sip_set_udptl_peer(struct ast_channel *chan, struct ast_udptl *udptl);
-static void change_t38_state(struct sip_pvt *p, int state);
+static void __change_t38_state(struct sip_pvt *p, int state, const char *function, int line);
+#define change_t38_state(a, b) __change_t38_state(a, b, __PRETTY_FUNCTION__, __LINE__)
 
 /*------ Session-Timers functions --------- */
 static void proc_422_rsp(struct sip_pvt *p, struct sip_request *rsp);
@@ -4193,7 +4194,7 @@
 }
 
 /*! \brief Change the T38 state on a SIP dialog */
-static void change_t38_state(struct sip_pvt *p, int state)
+static void __change_t38_state(struct sip_pvt *p, int state, const char *function, int line)
 {
 	int old = p->t38.state;
 	struct ast_channel *chan = p->owner;
@@ -4204,7 +4205,8 @@
 		return;
 
 	p->t38.state = state;
-	ast_debug(2, "T38 state changed to %d on channel %s\n", p->t38.state, chan ? chan->name : "<none>");
+	ast_debug(2, "T38 state changed to %d on channel %s by %s:%d\n", p->t38.state, chan ? chan->name : "<none>",
+		  function, line);
 
 	/* If no channel was provided we can't send off a control frame */
 	if (!chan)