diff -urN asterisk-1.2.18.orig/channels/chan_agent.c asterisk-1.2.18/channels/chan_agent.c
--- asterisk-1.2.18.orig/channels/chan_agent.c	2007-03-01 03:55:45.000000000 +0900
+++ asterisk-1.2.18/channels/chan_agent.c	2007-07-11 16:30:19.580457744 +0900
@@ -1996,6 +1996,8 @@
 						ast_device_state_changed("Agent/%s", p->agent);
 						while (res >= 0) {
 							ast_mutex_lock(&p->lock);
+							if (!p->loginstart && p->chan)
+								ast_softhangup(p->chan, AST_SOFTHANGUP_EXPLICIT);
 							if (p->chan != chan)
 								res = -1;
 							ast_mutex_unlock(&p->lock);