| Product Name | Cisco 1720 |
| Version | IOS 12.03T |
| ISAKMP Lifetime | 60 - 86400 seconds (Selectable) |
| Diffie-Hellman | Group-1/Group-2 Selectable |
| Perfect Forward Secrecy (PFS) | On/Off (Selectable) |
| Phase1 Encryption Algorithm |
DES |
| Phase1 Authentication Algorithm |
MD5/SHA1 Selectable |
| Phase2 ESP Transform |
ESP-DES-MD5 ESP-DES-SHA1 ESP-DES ESP-RFC1828 ESP-NULL-MD5 ESP-NULL-SHA1 (Selectable) |
| IPSEC SA LifeTime | 120 - 86400 seconds (Selectable)
2560 - 536870912 KByte (Selectable) |