diff -Naur asterisk-v1-0-1/channels/chan_agent.c asterisk/channels/chan_agent.c
--- asterisk-v1-0-1/channels/chan_agent.c	Fri Oct 15 00:41:00 2004
+++ asterisk/channels/chan_agent.c	Fri Oct 15 03:00:18 2004
@@ -519,9 +519,22 @@
 	ast->pvt->pvt = NULL;
 	p->app_sleep_cond = 1;
 	p->acknowledged = 0;
-	if (p->start && (ast->_state != AST_STATE_UP))
+
+	/* if they really are hung up then set start to 0 so the test
+	 * later if we're called on an already downed channel
+	 * doesn't cause an agent to be logged out like when
+	 * agent_request() is followed immediately by agent_hangup()
+	 * as in apps/app_chanisavail.c:chanavail_exec()
+	 */
+
+	ast_log(LOG_DEBUG, "Hangup called for state %s\n", ast_state2str(ast->_state));
+	if (p->start && (ast->_state != AST_STATE_UP)) {
 		howlong = time(NULL) - p->start;
-	time(&p->start);
+		p->start = 0;
+	} else if (ast->_state == AST_STATE_RESERVED) {
+		howlong = 0;
+	} else
+		p->start = 0; 
 	if (p->chan) {
 		/* If they're dead, go ahead and hang up on the agent now */
 		if (!ast_strlen_zero(p->loginchan)) {