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Another limitation occurs when attempting to place a call to a device that does not
support the requested call type. For example, a call placed from an ISDN data
terminal to an ISDN voice telephone will be rejected by the telephone.
In some cases, the call type and number of channels are satisfied and the called
device answers the call, but the calling application is not compatible with the called
application. For example, not all video conferencing applications use the same data
encoding. Or, a Terminal Adaptor that converts ISDN to RS-232 may answer a data
call that is carrying FAX information. A well-designed application determines that it
cannot process the data and releases the call. Otherwise the user must hang up.
What To Read Next
For a technical review of ISDN-BRI operation, including physical layer indications,
data link packet protocol, and call control signaling, read Chapter 2.
For a comprehensive review of Simulator provisioning, read Chapter 3.
For more details about Simulator operation , read Chapter 4.
For troubleshooting guidelines, technical references, read Chapter 5.