Hello Bryan,

There are two distinct things you need to look out for -

1) The ISDN protocol used. In Europe the ISDN protocol that is used is the DSS1 protocol, while in the USA there are a number of other protocols in use, like 5ESS and NI-1 (this depends on your ISDN provider in the USA). It is important that the codec you loan does indeed support the correct ISDN protocol.

2) In Europe ISDN lines are almost always terminated by the ISDN provider with an NT-1. The ISDN devices used in Europe therefore expect to connect to an NT-1. In the USA the provider does usually NOT provide the NT-1 termination. It is very likely that you will need to use an NT-1 between the European codec and the USA ISDN line. You may need to talk to your ISDN provider about this.

Hope this helps!

Best regards,

Edwin