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Help Contents > Configuring the ISDN gateway > Configuring general ISDN settings

Configuring General ISDN Settings

These settings are global settings which affect the configuration of the ISDN gateway with regard to ISDN network type

and options, as well as allowed call features. To access these settings, choose Home > Settings > ISDN.

Note that some ISDN configuration must be done on a port-by-port basis; see

Configuring ISDN Ports Settings.

Refer to the sections below for assistance configuring the general ISDN settings. After making any changes, click Apply

changes.

Basic settings

Field Field Description Usage Tips

ISDN interface type

Identifies the ISDN network type to which

the ISDN gateway is connected. Choose from

E1, T1 (USA and Canada), and T1 (Japan) as

appropriate.

E1 is usually used in the UK and mainland

Europe. T1 is usually used in the US and

Canada. T1 (Japan) is usually used in Japan.

Refer to your ISDN network provider if you

are unsure of which interface type to select.

The ISDN gateway may have to be restarted

for changes of this setting to take effect (see

Shutting Down the ISDN gateway).

E1 CRC-4 enabled

With an ISDN interface type of E1 selected,

this option selects whether ISDN signalling

should make use of the CRC-4 mechanism.

Most E1 ISDN networks require CRC-4 to be

enabled, although some (in particular, some

French networks) require it to be disabled.

Refer to your ISDN network provider if you

are unsure whether to enable or disable CRC-

The ISDN gateway may have to be restarted

for changes of this setting to take effect (see

Shutting Down the ISDN gateway).

Send "sending

complete"

An ISDN signalling protocol option. If you are unsure whether you need to

enable this option, refer to your ISDN

network provider.

Max incoming ISDN

call rate

Selects the maximum bandwidth at which

the ISDN side of ISDN to IP calls can be

established. The options offered show the

bandwidth in terms of Kbps, and the

corresponding number of ISDN B-channels

required.

This setting also enables you to use the

ISDN gateway as a PSTN to voice-over-IP

gateway (that is, as a voice-only gateway,

rather than a video-conferencing gateway);

in this case, set the call rate to Telephone.

Voice calls from the PSTN can then be placed

to IP telephones.

The value you enter here is the maximum

bandwidth for an incoming ISDN call. The

dial plan cannot override this value with a

higher maximum bandwidth. However, by

using the dial plan you can impose a lower

bandwidth for particular calls. Also, note that

the calling ISDN endpoint may elect to

establish a call at a lower bandwidth.

If you have selected Telephone, then the

ISDN gateway will forward ISDN calls as

audio-only IP calls (see

Using the ISDN

gateway for Voice-Only Calls).

Max outgoing ISDN

call rate

Selects the maximum bandwidth at which

the ISDN side of IP to ISDN calls can be

established. The options offered show the

bandwidth in terms of Kbps, and the

corresponding number of ISDN B-channels

required.

This setting also enables you to use the

ISDN gateway as a voice-over-IP to PSTN

gateway (that is, as a voice-only gateway,

rather than a video-conferencing gateway);

in this case, set the call rate to Telephone.

Voice calls from IP telephones can then be

placed to regular PSTN telephones.

The value you enter here is the maximum

bandwidth for an outgoing ISDN call. The

dial plan cannot override this value with a

higher maximum bandwidth. However, by

using the dial plan you can impose a lower

bandwidth for particular calls. Also, note that

the calling ISDN endpoint may elect to

establish a call at a lower bandwidth.

If you have selected Telephone, then the

ISDN gateway will forward IP calls as audio-

only ISDN calls (see

Using the ISDN gateway

for Voice-Only Calls).

Maximum call

duration

Allows the length of all calls to be limited. It

is possible to select no limit.

You may wish to impose a maximum call

duration to limit ISDN calling costs.

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Cisco ISDN GW 3241 Guide de l'utilisateur Page 35

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