diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 22a3457675a1fb5979efa1704eb13c78f56a7859..e1dfd5ddd89c732b26bde47607b5b02aae278b10 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -10437,6 +10437,15 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req, int t38action
 				  type, value,
 				  (processed == TRUE)? "OK." : "UNSUPPORTED OR FAILED.");
 		}
+
+		/* Ensure crypto lines are provided where necessary */
+		if (audio && secure_audio && !processed_crypto) {
+			ast_log(LOG_WARNING, "Rejecting secure audio stream without encryption details: %s\n", m);
+			return -1;
+		} else if (video && secure_video && !processed_crypto) {
+			ast_log(LOG_WARNING, "Rejecting secure video stream without encryption details: %s\n", m);
+			return -1;
+		}
 	}
 
 	/* Sanity checks */