Codan 8525B Series Handbook page 13

Your transceiver can be used as a free-tuning receiver
Free-tuning
receiver covering the world broadcast bands over the frequency range
of 250 kHz to 30 MHz.
Tone calling This facility allows you to send a tone call (two tones
transmitted simultaneously) to call the RFDS or OTC
(Telstra).
Telephone If a base station is connected to an IPC-500 telephone
interconnect interconnect in a network, your Outback HF Radiophone can
be used to make telephone calls into the public telephone
system.
OTC (Telstra) OTC (Telstra) selective call allows you to transmit a call to a
selective call specific Telstra station. The station then enables you to make
telephone calls into the public telephone system.
Outback HF Radiophone
Overview
q
2-3