Canon VB-C500D Operation Manual page 58

IPsec Settings (IPsec)
(20) [SA AH SPI (inbound)]
Set the SA SPI value for inbound. Set a desired value in a range of 256 to 4294967295. Since
this setting is used as an ID for identifying the SA, be careful not to specify an inbound SPI
whose value is already used the SPI for other AH.
Note
To use this camera using IPsec, the communicating destinations and network must be set
beforehand. For these settings, contact your System Administrator.
If any setting is changed from the [IPsec] menu, the camera may no longer become
accessible from the active browser. Check beforehand the precautions explained in "Notes"
in "Setting the Items Requiring Rebooting (Reboot Item)" (
1-44
P. 1-46).