diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 947b64b0e4559149fcfeba2d230c21243e5d3eb8..f50d837dbc74111dab76b5e6a88647e33d2b9ba0 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -4789,7 +4789,7 @@ static int dialog_initialize_rtp(struct sip_pvt *dialog)
 	ast_rtp_instance_set_prop(dialog->rtp, AST_RTP_PROPERTY_DTMF, ast_test_flag(&dialog->flags[0], SIP_DTMF) == SIP_DTMF_RFC2833);
 	ast_rtp_instance_set_prop(dialog->rtp, AST_RTP_PROPERTY_DTMF_COMPENSATE, ast_test_flag(&dialog->flags[1], SIP_PAGE2_RFC2833_COMPENSATE));
 
-	ast_rtp_instance_set_qos(dialog->rtp, global_tos_audio, 0, "SIP RTP");
+	ast_rtp_instance_set_qos(dialog->rtp, global_tos_audio, global_cos_audio, "SIP RTP");
 
 	do_setnat(dialog);
 
diff --git a/res/res_rtp_asterisk.c b/res/res_rtp_asterisk.c
index 396aed5339274ce8d8ee26b1fece869d4fdff139..df7cf27b59d48e63b87b23a6c8b3c6c2e5546d9b 100644
--- a/res/res_rtp_asterisk.c
+++ b/res/res_rtp_asterisk.c
@@ -270,6 +270,7 @@ static int ast_rtp_get_stat(struct ast_rtp_instance *instance, struct ast_rtp_in
 static int ast_rtp_dtmf_compatible(struct ast_channel *chan0, struct ast_rtp_instance *instance0, struct ast_channel *chan1, struct ast_rtp_instance *instance1);
 static void ast_rtp_stun_request(struct ast_rtp_instance *instance, struct ast_sockaddr *suggestion, const char *username);
 static void ast_rtp_stop(struct ast_rtp_instance *instance);
+static int ast_rtp_qos_set(struct ast_rtp_instance *instance, int tos, int cos, const char* desc);
 
 /* RTP Engine Declaration */
 static struct ast_rtp_engine asterisk_rtp_engine = {
@@ -293,6 +294,7 @@ static struct ast_rtp_engine asterisk_rtp_engine = {
 	.dtmf_compatible = ast_rtp_dtmf_compatible,
 	.stun_request = ast_rtp_stun_request,
 	.stop = ast_rtp_stop,
+	.qos = ast_rtp_qos_set,
 };
 
 static inline int rtp_debug_test_addr(struct ast_sockaddr *addr)
@@ -2549,6 +2551,13 @@ static void ast_rtp_stop(struct ast_rtp_instance *instance)
 	ast_set_flag(rtp, FLAG_NEED_MARKER_BIT);
 }
 
+static int ast_rtp_qos_set(struct ast_rtp_instance *instance, int tos, int cos, const char *desc)
+{
+	struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
+
+	return ast_set_qos(rtp->s, tos, cos, desc);
+}
+
 static char *rtp_do_debug_ip(struct ast_cli_args *a)
 {
 	char *arg = ast_strdupa(a->argv[4]);