Main specifications product description cisco 891f router isdn mdm desktop rack mountable device type router isdn analogue modem combo 8 port switch integrated enclosure type desktop rack mountable 1u data link protocol ethernet fast ethernet gigabit ethernet capacity ipsec vpn tunnels50 network transport protocol l2tp rsvp icmp ip ipsec ftp dhcp dns l2tpv3 ddns rtp routing protocol ospf rip 1 rip 2 bgp eigrp hsrp vrrp nhrp gre ospfv