Pabx OS7100 IP Phone 7 Button. Using VPN to connect remote site. Using Netgear DG834G router on both sides. Phone works fine. Problem starts when dsl or router goes of. Phone won't log back in. Have to factory default phone. Insert all settings and then phone logs in. While phone is trying to reconnect I can ping phone from main site. From remote site I can ping MCP card. VPN status shows it is connected. Any help on this.