Different PABX/Switch manufacturers provide different or System specific protocols or Interfaces e. g. UP0-Interfaces. If ISDN End devices need to be connected with different Interfaces/protocols this can then become a problem. Our PT series of products not only allow the extension, but also the ability to change the ISDN interface/protocols to alleviate this problem:
| Existing Protocol/Interface | Required Protocol/Interface | Recommended Product |
| UP0 | BRI | PT-UPS |
| BRI | UP0 | PT-SUP |
| U0 | BRI | PT-US |
| BRI | U0 | PT-SU |
On the right hand side you can click your way to proven uses of the PT-UPS.