Your ISDN service is provided through an ISDN switch at your telephone company. The switch types are listed below:
| ISDN Switch | Description |
| ni-2 | National ISDN-2 (NI-2) compliant. This is the default |
| dms-100 | Northern Telecom DMS-100. |
| 4ess | AT&T 4ESS. |
| att-5ess | AT&T 5ESS. |
| net5 | European ISDN PRI standard. |
| vn2 | France (older switch). |
| vn3 | France (older switch). |
| Itr6 | Germany (older switch). |
| ntt | Japan. |
| kdd | Japan. |
| ts014 | Australia. To use this switch type, set the port type ot network hardwired, set the directory number for the port appropriatly. and reset the port. |