3Com OfficeConnect 3C886A Release Note page 17

7 In the Data Compression field, choose to have data compression active or inactive.
By default compression is disabled. (In order for compression to occur, the other
end of the connection must have the same compression active.)
Callback Parameters
This section allows you to enable and configure callback functionality. Callback
occurs when, upon a successful connection of a dial-in a user, the LAN Modem
drops the incoming call and places a return call to the dial-in user.
To specify your Callback parameters, do the following. In order for callback to
occur, the other end of the connection must support callback functionality and
have it enabled. For more information refer to "Service Provider Callback Feature".
1 In the Enable Callback field, check to activate Callback for this dial-in user. By
default Callback is disabled.
2 In the Callback Telephone Number field, enter the number the LAN Modem will
call back when this dial-in user accesses the LAN Modem, to verify the dial-in
user's authenticity. Note that this value will override the telephone number
provided by the client, if the client provides a different number.
3 In the Callback Authentication field, check the box to require callback
authentication. Note that Callback Authentication is not required for callback
functionality, but provides a further level of security by confirming the server's
authenticity to the dial-in user.
4 In the Callback Username and Password fields, enter the username and password
which the client will use to verify the server's authenticity. If the dial-in client is a
LAN Modem, these values will match the username and password of the client
LAN Modem's Callback Login and Password fields, located on the client LAN
Modem's service provider parameters page.
5 In the Callback Delay field, enter the amount of time in seconds to wait until the
dial-in user is called back. By default this is set to 5.
WAN Parameters
1 LAN Modem WAN IP: If the local LAN Modem WAN link has a static IP address,
enter the WAN static IP address. Otherwise leave these fields as set by the Dial-in
Wizard. If you are using the Advanced dial-in scenario, enter the IP address of the
LAN Modem which is receiving the dial-in call.
2 Remote Entity WAN IP: If the remote site of the WAN link has a static IP address,
enter the WAN static IP address. Otherwise leave these fields as set by the Dial-in
Wizard. For the Advanced dial-in scenario, enter the IP address of the router which
is dialing into the LAN Modem.
3 Remote Entity WAN Subnet Mask: If the remote site of the WAN link has a static IP
address, enter the WAN subnet mask address. Otherwise leave these fields as set
by the Dial-in Wizard. If you are using the Advanced dial-in scenario, enter the
subnet mask of the remote LAN.
4 Enter your Primary and Secondary (optional) DNS address as instructed by your
MIS administrator, or as set by the Dial-in Wizard. For the Advanced dial-in
scenario, enter the IP address of the LAN Modem which is receiving the dial-in call.
5 Click Submit.
Configuring the Server-side Dial-in User Parameters Page 17