From 515f2ee61e9616e3244eb76b96587f699e1d4a44 Mon Sep 17 00:00:00 2001
From: Jakub Adam <jakub.adam@ktknet.cz>
Date: Thu, 22 Mar 2012 21:11:14 +0100
Subject: [PATCH] media: detect incompatible encryption levels error with Lync
 2010

Reported in #3510001

Also make the error message consistent in all situations.
---
 src/core/sipe-media.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/core/sipe-media.c b/src/core/sipe-media.c
index fbebad8a..d1a847ae 100644
--- a/src/core/sipe-media.c
+++ b/src/core/sipe-media.c
@@ -1050,7 +1050,25 @@ process_invite_call_response(struct sipe_core_private *sipe_private,
 				title = _("Call rejected");
 				g_string_append_printf(desc, _("User %s rejected call"), with);
 				break;
-			case 488:
+			case 488: {
+				/* Check for incompatible encryption levels error.
+				 *
+				 * MS Lync 2010:
+				 * 488 Not Acceptable Here
+				 * ms-client-diagnostics: 52017;reason="Encryption levels dont match"
+				 *
+				 * older clients (and SIPE itself):
+				 * 488 Encryption Levels not compatible
+				 */
+				const gchar *ms_diag = sipmsg_find_header(msg, "ms-client-diagnostics");
+
+				if (sipe_strequal(msg->responsestr, "Encryption Levels not compatible") ||
+				    (ms_diag && g_str_has_prefix(ms_diag, "52017;"))) {
+					title = _("Unable to establish a call");
+					g_string_append(desc, _("Encryption settings of peer are incompatible with ours."));
+					break;
+				}
+
 				if (call_private->ice_version == SIPE_ICE_RFC_5245 &&
 				    sip_transaction_cseq(trans) == 1) {
 					gchar *with = g_strdup(call_private->with);
@@ -1065,6 +1083,7 @@ process_invite_call_response(struct sipe_core_private *sipe_private,
 					return TRUE;
 				}
 				// Break intentionally omitted
+			}
 			default:
 				title = _("Error occured");
 				g_string_append(desc, _("Unable to establish a call"));
-- 
2.11.4.GIT