diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index db6fab255b..c89d18e1dc 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -3851,6 +3851,28 @@ static int iax2_hangup(struct ast_channel *c)
 	return 0;
 }
 
+/*!
+ * \note expects the pvt to be locked
+ */
+static int wait_for_peercallno(struct chan_iax2_pvt *pvt)
+{
+	unsigned short callno = pvt->callno;
+
+	if (!pvt->peercallno) {
+		/* We don't know the remote side's call number, yet.  :( */
+		int count = 10;
+		while (count-- && pvt && !pvt->peercallno) {
+			DEADLOCK_AVOIDANCE(&iaxsl[callno]);
+			pvt = iaxs[callno];
+		}
+		if (!pvt->peercallno) {
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
 static int iax2_setoption(struct ast_channel *c, int option, void *data, int datalen)
 {
 	struct ast_option_header *h;
@@ -3863,8 +3885,23 @@ static int iax2_setoption(struct ast_channel *c, int option, void *data, int dat
 		errno = ENOSYS;
 		return -1;
 	default:
-		if (!(h = ast_malloc(datalen + sizeof(*h))))
+	{
+		unsigned short callno = PTR_TO_CALLNO(c->tech_pvt);
+		struct chan_iax2_pvt *pvt;
+
+		ast_mutex_lock(&iaxsl[callno]);
+		pvt = iaxs[callno];
+
+		if (wait_for_peercallno(pvt)) {
+			ast_mutex_unlock(&iaxsl[callno]);
+			return -1;
+		}
+
+		ast_mutex_unlock(&iaxsl[callno]);
+
+		if (!(h = ast_malloc(datalen + sizeof(*h)))) {
 			return -1;
+		}
 
 		h->flag = AST_OPTION_FLAG_REQUEST;
 		h->option = htons(option);
@@ -3875,6 +3912,7 @@ static int iax2_setoption(struct ast_channel *c, int option, void *data, int dat
 		ast_free(h);
 		return res;
 	}
+	}
 }
 
 static struct ast_frame *iax2_read(struct ast_channel *c) 
@@ -4161,17 +4199,9 @@ static int iax2_indicate(struct ast_channel *c, int condition, const void *data,
 	ast_mutex_lock(&iaxsl[callno]);
 	pvt = iaxs[callno];
 
-	if (!pvt->peercallno) {
-		/* We don't know the remote side's call number, yet.  :( */
-		int count = 10;
-		while (count-- && pvt && !pvt->peercallno) {
-			DEADLOCK_AVOIDANCE(&iaxsl[callno]);
-			pvt = iaxs[callno];
-		}
-		if (!pvt->peercallno) {
-			res = -1;
-			goto done;
-		}
+	if (wait_for_peercallno(pvt)) {
+		res = -1;
+		goto done;
 	}
 
 	switch (condition) {