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DIAL PLAN
The dialing plan for System 25 is based on the concept that, whenever possible, calls should
be placed to individuals
rather than to voice terminals.
To implement this concept,
individuals are assigned Personal Dial Codes (PDCs) and are allowed to log in those PDCs at
other voice terminals.
There are two types of PDCs: assigned and floating. An assigned
PDC is associated with each voice terminal. Floating PDCs are administered at the SAT and
may (optionally) be associated with the attendant position when not logged in.
Data extensions on System 25 are assigned Data Dial Codes (DDCs).
Dial Code Assignments
System 25 dial codes are as follows:
Assignable System 25 dial codes may have 1, 2, 3, or 4 digits.
These include voice terminal
PDCs, data terminal DDCs, Direct Group Calling (DGC) Groups, Paging Access, Attendant
Call Park, Night Service, Modem Request, Automatic Route Selection Access, Facility Access
(trunk group), and Dictation System A
CceSS codes.
System 25 fixed dial codes are:
● 0—Attendant access
● *1, *2, *3—Reserved for maintenance calls
● *4—Activate Make-Busy for DGC group member
● *5—Call Park
● *6—Deactivate Make-Busy for DGC group member
● *7 + 0—Group Call Pickup Answer
● *7 + PDC—Directed Call Pickup Answer
● *8 + PDC–Call Park Retrieval
● *9–Camped on Call Retrieval
● *0—Account Code Entry from single-line voice terminals
●
** PDCPDC— Login PDC (Call Following)
●
**PDC0—Logout PDC (Call Following)
● **0—Logout all PDCs (Call Following)
●
## PDC-Call Accountability
● *—PAUSE character used in programmed numbers
●
#100-#189— System Speed Dial Codes
●
#190-#199—Virtual Facility Codes (V2)
●
#20-#26—Personal Speed Dial Codes
●
#3—Start end-to-end signaling in programmed numbers (V2 only)
● #4—Activate Program mode
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