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the MNO will be dynamic so it will change periodically, and the MNO may block access to this IP address
with a firewall.
When the cellular service is provided by a Mobile Virtual Network Operator (MVNO), the IP address
reported by the USR3520/USR803520 GUI or I7 screen is not public and routable. The reported IP address
is used only by the MVNO to route traffic to the USR3520/USR803520 on the cellular operator's network.
The MVNO will translate the IP address using Network Address Translation (NAT) and provide you with a
different routable IP address, but the USR3520/USR803520 cannot report that IP address. The MVNO will
control whether your IP address is private or public, and static or dynamic.
How do I configure a Modemulator for connection to the Vodafone UMTS
network?
1. The Vodafone network requires any cellular device to report a Username and Password in order for the
cellular connection to complete. The Username and Password are not assigned by Vodafone or by an
MVNO, so an arbitrary Username and Password can be chosen by the User. Consult the
USR3520/USR803520 Gateway User Guide
2. Follow the instructions in the
UMTS" network setting in the embedded GUI.
3. Enter the APN given by your cellular service provider. Consult the
Guide
for instructions on entering an APN.
4. The embedded GUI of the USR3520/USR803520 has a "Connect while on international roaming"
feature. Depending on how the Vodafone SIM is provisioned and on the geographical location of the
gateway, you may need to enable this setting.
The SIM is programmed with a Mobile Network Code (MNC) and a Mobile Country Code (MCC).
When a cellular device is connecting to a cellular network, the device receives the network's MNC
and MCC which it compares to the MNC and MCC programmed in the SIM. If the SIM MNC doesn't
match the network MNC, a roaming connection is established if the cellular service allows roaming
to that local cellular network. If also the SIM MCC doesn't match the network MCC, the connection
is international roaming. Contact your cellular service provider to determine your SIM's home
country, and whether roaming to your local cellular network is allowed.
How do I restore the Modemulator expansion card to factory settings?
To restore the Modemulator operating parameters in the i4 screen to factory values and make the factory
values non-volatile, enter this command string:
AT&F1&W <enter>
Modemulator User Guide
for instructions on entering a Username and Password.
USR3520/USR803520 Gateway User Guide
Page 73 of 113
for selecting the "Generic
USR3520/USR803520 Gateway User
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