Campbell Scientific Raven110 GPRS/EDGE Digital Cellular Modem - Manual (Page 36)

Appendix D. Understanding APNs
D-2
These mobile connections are visible on the public Internet so security and
traffic blocking need to be taken into consideration. The customer back-end
connection only needs to provide Internet access.
Custom APN: A custom APN is just that – custom. In this case the end-
customer works with Cingular to determine the appropriate settings for:
IP addressing requirements: Are public IP addresses required? If so, who
provides the addresses – Cingular or the customer? Do these addresses need to
be static?
Connection from Cingular to customer network: Cingular can provide the
following connectivity options from their network to the customer’s network,
depending on security and cost requirements:
• Dedicated frame relay connection where the Cingular-to-customer
connection is not publicly accessible.
• Internet VPN connection where the Cingular-to-customer connection is via
IPsec VPN.
• Internet connection: Can be lower cost if security requirements allow such
connections as no security is provided by Cingular.