Configuration of ISDN interfaces

You must configure one of your Multiple Subscriber Numbers (MSN) so that IPSec callback is used for incoming calls.

Go to the following menu to configure an MSN for IPSec callback at head office:

Go to Physical Interfaces -> ISDN Ports -> MSN Configuration -> New.

Physical Interfaces -> ISDN Ports -> MSN Configuration -> New

Field	Meaning
ISDN Port	Enter the port to which the ISDN connection is connected.
Service	Defines the service used to respond to the MSN.
MSN	This is the subscriber number of the service.
MSN Recognition	Defines the type of incoming number check.
Bearer Service	Defines whether to respond to a voice or data call or both.

Proceed as follows:

Set ISDN Port to bri-0 .
Select the Service IPSec .
Under MSN enter the MSN to which the gateway should respond with an IPSec callback, in this example 840 .
Leave MSN Recognition set to Right to Left .
Leave the Bearer Service set to Data + Voice .
Confirm with OK.

Configure an MSN to the gateway in the branch in the same way.

	Note
	If your gateway is connected to a point-to-point ISDN connection, it may be necessary to set MSN Recognition to `Left to Right (DDI)` .