- The IP400 Office So8 module provides 8 S-Bus interfaces for Basic Rate ISDN devices
- The IP Office So8 expansion module supports both point-to-point and point-to-multipoint connections. A maximum of 10 terminal endpoints identifiers (TEIs) are supported on each bus.
- Not Included: Power Lead
- Included: IP400 EXP RJ45 / RJ45 1M Blue for connecting Expansion Module to Base Unit