Setting ISDN Parameters

To access the ISDN Parameters screen enter CO IS PA at the command prompt. The screen illustrated in Figure 2-51 is displayed.

Figure 2-51

ISDN Parameters Screen

The following preferences can now be changed, if required.

Network Type Toggle the network type to match the ISDN service provided by your ISDN service provider. If you are unsure about the network type, check with your ISDN service provider.

SPID This is a service profile ID and is used in some public networks, typically in the USA. The SPID takes the form of a unique customer identification number which is given by the ISDN network provider. This number is entered here. (This field may not be visible on non-US models.)

Directory Number Enter the ISDN number associated with each SPID. (This field may not be visible on non-US models.)

LAN MSN (400 and 500 only) The MSN (Multiple Subscriber Numbering) is a facility offered by some public ISDN network providers. The MSN number can be used to identify specific devices connected to a single ISDN Basic Rate (BRI) line. If you are using MSN, type the MSN number associated with the LAN port for data transmission. Any calls to this number will be forwarded to the LAN port.

Voice MSN (400 and 500 only) Assigning a different MSN number to the LAN and Voice Port, incoming calls can be directed effectively to the type of equipment offering the appropriate service. If you are using MSN, type the MSN number associated with the Voice port. Any voice calls to this number will be forwarded to the Voice port.

Send MSN (400 and 500 only) Enabling this field allows the MSN assigned to each port above to be sent out with an outgoing call. This then allows the destination to check from where the call has come.

Check MSN (400 and 500 only) The facility to check the MSN on an incoming call is enabled or disabled by this field. It enables the local unit to identify the MSN on an incoming call. This parameter is set to DISABLE by default.

LAN SA (400 and 500 only) ISDN Sub-Addressing is a facility offered by some public ISDN network providers. The MSN number can be used to identify specific devices connected to a single ISDN Basic Rate (BRI) line. Type the sub-address number associated with your LAN.

Voice SA (400 and 500 only) Type the sub-address number provided for voice calls so that they are directed to the voice port.

Send SA (400 and 500 only) When enabled, sends the sub-address numbers as part of the caller ID.

Check SA (400 and 500 only) When enabled, checks for sub-address numbers as part of the incoming caller ID.

SA Type (400 and 500 only) Set to the sub address type used by your ISDN service provider. This is usually NSAP.

Report Busy (400 and 500 only) Enabling this option causes the unit to report a busy status to the public ISDN network when no further calls can be accepted.

This differs from the normal situation where the unit is busy and a call is not accepted, the network clears the call after a time-out. In the case where public ISDN network receives a busy message from one or more units on an ISDN line, the call is cleared across the whole network with a user determined user busy condition.

Answer Voice as Data (500 only) By default this option is disabled. Some ISDN service providers allow data to be transmitted as voice calls. If you want to answer voice calls as data, set this field to ENABLED. This option is useful if local voice calls are free. You also need to set the Call Type appropriately in the Quick Configuration or ISDN Numbers table screens.

Maximum Call Duration Sets the maximum length of any ISDN call in minutes. After this time the call is terminated. This feature is sometimes referred to as call guillotine. The default value for this field is 60 minutes. To disable this feature, set the Maximum Call Duration to 0.

© 3Com Corporation