diff --git a/src/switch_core_media.c b/src/switch_core_media.c
index d276bc4f1e..8201c1d86c 100644
--- a/src/switch_core_media.c
+++ b/src/switch_core_media.c
@@ -10011,7 +10011,7 @@ static void generate_m(switch_core_session_t *session, char *buf, size_t buflen,
 				switch_snprintf(buf + strlen(buf), buflen - strlen(buf), "a=rtpmap:%d telephone-event/%d\r\n",
 								smh->dtmf_ianacodes[i], smh->rates[i]);
 			} else {
-				switch_snprintf(buf + strlen(buf), buflen - strlen(buf), "a=rtpmap:%d telephone-event/%d\r\na=fmtp:%d 0-16\r\n",
+				switch_snprintf(buf + strlen(buf), buflen - strlen(buf), "a=rtpmap:%d telephone-event/%d\r\na=fmtp:%d 0-15\r\n",
 								smh->dtmf_ianacodes[i], smh->rates[i], smh->dtmf_ianacodes[i]);
 			}
 		}
@@ -10728,7 +10728,7 @@ SWITCH_DECLARE(void) switch_core_media_gen_local_sdp(switch_core_session_t *sess
 				switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=rtpmap:%d telephone-event/%d\r\n",
 								smh->mparams->te, smh->mparams->te_rate);
 			} else {
-				switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=rtpmap:%d telephone-event/%d\r\na=fmtp:%d 0-16\r\n",
+				switch_snprintf(buf + strlen(buf), SDPBUFLEN - strlen(buf), "a=rtpmap:%d telephone-event/%d\r\na=fmtp:%d 0-15\r\n",
 								smh->mparams->te, smh->mparams->te_rate, smh->mparams->te);
 			}
 		}