Suitable for pure IP environments as well as hybrid PSTN + VoIP systems, TwinStar™ II supports plug-and-play functionality, in which DAHDI devices, such as Xorcom Astribank telephony interfaces, can be added or removed from live Asterisk-based IP-PBX while it remains fully operational. Automatic replication and detection mechanism detects server failure and switches all telephony to backup server, keeping downtime to minimum.