DTMF begin frames should be ignored so that when an agent acks a call with the '#' key,

he doesn't cause a queue's announce file to be interrupted. Also went ahead and did the
same for the '*' key and for ending a call.

(closes issue #10528, reported by deskhack, patched by me)



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@81120 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_agent.c

@@ -494,6 +494,12 @@ static struct ast_frame *agent_read(struct ast_channel *ast)
  			}
  			break;
 		case AST_FRAME_DTMF_BEGIN:
+			/*ignore DTMF begin's as it can cause issues with queue announce files*/
+			if((!p->acknowledged && f->subclass == '#') || (f->subclass == '*' && endcall)){
+				ast_frfree(f);
+				f = &ast_null_frame;
+			}
+			break;
  		case AST_FRAME_DTMF_END:
  			if (!p->acknowledged && (f->subclass == '#')) {
  				if (option_verbose > 2)