Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 306575)
+++ channels/chan_sip.c	(working copy)
@@ -22332,13 +22332,24 @@
 	ast_set_flag(&p->flags[0], SIP_DEFER_BYE_ON_TRANSFER);	/* Delay hangup */
 
 
-	/* For blind transfers, move the call to the new extensions. For attended transfers on multiple
-	   servers - generate an INVITE with Replaces. Either way, let the dial plan decided  */
-	/* indicate before masquerade so the indication actually makes it to the real channel
-	   when using local channels with MOH passthru */
-	ast_indicate(current.chan2, AST_CONTROL_UNHOLD);
-	res = ast_async_goto(current.chan2, p->refer->refer_to_context, p->refer->refer_to, 1);
+	{
+		char refer_to_context[AST_MAX_EXTENSION];
+		char refer_to[AST_MAX_EXTENSION];
+		/* For blind transfers, move the call to the new extensions. For attended transfers on multiple
+		 servers - generate an INVITE with Replaces. Either way, let the dial plan decided  */
+		/* indicate before masquerade so the indication actually makes it to the real channel
+		 when using local channels with MOH passthru */
+		ast_indicate(current.chan2, AST_CONTROL_UNHOLD);
 
+		/* Both are SAFE */
+		strcpy(refer_to_context, p->refer->refer_to_context);
+		strcpy(refer_to, p->refer->refer_to);
+
+		sip_pvt_unlock(p);
+		res = ast_async_goto(current.chan2, refer_to_context, refer_to, 1);
+		sip_pvt_lock(p);
+	}
+
 	if (!res) {
 		ast_manager_event_multichan(EVENT_FLAG_CALL, "Transfer", 2, chans,
 			"TransferMethod: SIP\r\n"