The Innkeeper 1rx Digital Hybrid from JK Audio is housed in a single rack-space chassis. The main function of a hybrid is to extract a caller's voice coming in on a phone line, while keeping it separate from the receiver's outgoing audio. Both these streams can then be controlled in various ways. A digital hybrid provides audio that is clearer and cleaner over the variation in quality found in analog hybrids. The unit functions with both "wet" and "dry" (PBX) phone lines; dry line installation is always a custom configuration, requiring substantial telephone system knowledge.