Anyone intending to join the VoIP-world but not wanting to totally dispense with the functionality of ISDN can optionally equip Asterina with up to 2 ISDN S0 (4 voice channels) and so realize a smooth migration of the communications infrastructure.

Thus connections to the public ISDN-net as well as existing ISDN-extension lines can be realized.

In conjunction with the LCR-module and the ISDN-connection routine algorithms can be accomplished which can use the ISDN-connectivity as downright last fallback.

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