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This section describes how to place voice and fax calls using the ISDN interface of the HSD 
SATCOM system. 

Placing voice and fax calls using the HSD system are similar to placing an international 
telephone call or entering a telephone number for dial-up networking data calls. Like 
international telephone numbers, the HSD “dialing-number-sequence” includes different 
“routing” components or codes. Figure 2–4 illustrates the required order of the dialing 
components.

Each dialing sequence component serves a different routing function:

•

Dial Code Prefix:

Use service-specific dial code prefixes when sending fax or using analogue modems, 
or for overriding system defaults to force the system to request a specific service type. 
The illustration uses the dial code prefix for 3.1 KHz audio service type (*82*). (See 
Table 2–9.)

•

International Access Code:

The international access code for all airborne equipment is 00. However, when calling 
the aircraft during ground-to-air calls, use the international code of the ground location 
where the call is originating from.

•

Country Code:

Public Switch Telephone Network (PSTN) number assigned to the country of your call 
destination. (Example: “1” is the Country Code for North America.)

•

Area Code (and City Code, if applicable):

PSTN routing number assigned to the area (and if applicable, city) of your 

 

call destination.