Nortel Networks 9150 - Manual (Page 265)

Remote Gateway 9150 Installation and Administration Guide 235
January 2005 Configuring the Remote Gateway 9150 unit
ISDN configuration
In order to configure European ISDN, the PSTN must support the following
features:
!
Multiple Subscriber Numbering (MSN)
!
Two directory numbers (one per B channel)
The default configuration setting for BRI SPIDs is NC (Not Configured). Ensure
that no supplemental ISDN services, (for example, Call Waiting) are provided as
this may disrupt the data path and drop calls.
European ISDN
When configuring EuroISDN and ETSI variants, the BRI Configuration SPIDs
must be set to NC (not configured).
To change EuroISDN SPID values, complete the following procedure:
1 Go to Configuration Manager > 9150 > BRI Configuration.
2 Click on the Default button.
3 Configure the DNs, SPIDs, and ISDN line type.
Note: Only A-Law configuration is fully supported with ETSI configurations.
National ISDN
If you select National ISDN as the line type, there are minor protocol differences
between National ISDN -1, -2, -3, and -4. The Proprietary Switch line type is
more general and is an acceptable alternative if you encounter problems.