The Overseas Telecommunications Commission (Aust) printed a variety of forms and envelopes for use with telegrams and cables.
The pre-decimal currency and decimal currency telegram rates for international messages are shown elsewhere.
A summary of the known types is listed below under the following headings:
| IAO-TO-1. Has 11 ruled lines under the heading for the message. Reference to DEFERRED OR LETTER TELEGRAM signature under the message area. | No image presently available but see Hancock p. 346. 
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| IAO-TO-2. Message area is blank. Has a box at top left with types of telegram available. Has box for Name and Address plus Phone at the base. |  | 
| IAO-TP-1. Heading is INTERNATIONAL PRESS TELEGRAM. Printed in blue on yellow paper. |  | 
| IAO-DO-1. Printed in blue on cream paper. Has heading INTERNATIONAL TELEGRAM. |  | 
| IAO-DO-2. Printed in red on cream paper. Has heading INTERNATIONAL TELEGRAM. |  | 
| IAO-DO-3. |  | 
| Roll format. Heading at sides with three different formats. Sidemasts printed in red or in purple. |  | 
| IAO-EO-1. Opaque envelope printed in blue on white paper. Heading is printed in two lines. Reference to OTC at the base is printed in two lines. |  | 
| IAO-EO-2. Opaque envelope printed in red on white paper. Heading is in one line and is reverse printed. Reference to OTC at the base is direct printed in one line. |  | 
| IAO-EO-3. Window envelope printed in red on white paper. There is no border around the window. Heading has first and third lines reverse printed. 
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| Window envelope with a red border around the window (either rectangular or with rounded corners). Has top two lines reverse printed with the line "AUSTRALIA'S OVERSEAS ... direct printed above the window. |  | 
| Window envelope printed in red on white paper. Heading has INTERNATIONAL in outlined letters while TELEGRAM is in normal font. The security pattern differs amongst the three varieties. 
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| Window envelope with no markings. OTC AUSTRALIA logo is visible through the window. |  |