What is Soft-fax and Soft-modem?
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A user on an ISPBX can use different D-Channel protocols to those in use by the public ISDN network connected to the ISPBX - true or false?
What is ISDN's history?
If none of the equipment connected to an NT1 requires a power supply through the interface, do I need to attach the NT1 to the mains?
What Bearer Capabilities are and on which channel they reside?
What are BRI and PRI? What are Channels?
How configuration errors in the ISPBX can prevent successful connections?
What is the call termination message called?
What happens when a call is set up?
How ISDNs are connected together?
How can I get more information?
What is the initial call request message called?
What channel does the end-to-end connection use?