Also focusing on smaller deployments is Siemens, which is set to launch its BizIP offering for small offices. The product includes SIP-based, peer-to-peer IP phones and a broadband router/firewall/VoIP and PSTN gateway; the BizIP AD 20, plugs into a broadband cable modem or DSL link and provides Power over Ethernet LAN links to the BizIP410e phones. The BizIP AD 20 also can connect to an ISDN link for PSTN connectivity - in case the IP connection to a provider fails. Call control and PSTN access over the IP network would be delivered by a VoIP service provider offering SIP-based trunks and direct inward dialing number services over IP.