More minor bkw fixes

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2940 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -3681,6 +3681,7 @@ static int parse_contact(struct sip_pvt *pvt, struct sip_peer *p, struct sip_req
 		p->expire = -1;
 		ast_db_del("SIP/Registry", p->name);
 		strcpy(p->useragent, "");
+		p->lastms = 0;
 		if (option_verbose > 2)
 			ast_verbose(VERBOSE_PREFIX_3 "Unregistered SIP '%s'\n", p->name);
 		return 0;