The SPDC is conceived for up to 10000 destinations that can be distributed as desired among a maximum of 16 speed dialing lists. Each list can continue a maximum of 1000 destinations. Each terminal/port can be allocated up to 2 lists with the AMO SCSU, SBCSU, or SSCSU. These are lists 0 to 15.

If only one speed dialing access code is assigned in the dial plan (only DAR=SPDC1 is assigned by AMO WABE), the speed dialing indexes assigned in the first list of any terminal/port should not overlap the indexes assigned in the second list of the same terminal/port. The lowest index in the second list should be a higher number than the highest index assigned in the first list. The number of digits of the indexes of the first and second list have to be the same. These prerequisites (no overlapping, correct order of indices of the first and second list) are not checked by any AMO, but have to be assured by the service personnel. Users can access up to 1000 speed-dialing numbers. If there are overlapping indexes, the indexes of the first list cover the indexes of the second list. Despite the fact that the covered indexes of the second list cannot be accessed via access code (DAR=SPDC1) they can be accessed via speed dialing keys, however.

If two speed dialing codes are assigned in the dial plan (DAR=SPDC1 and DAR=SPDC2 are assigned by AMO WABE), the speed dialing indexes can be assigned more than once. Users can access up to 2000 speed dialing numbers.

Speed dialing destinations can have up to 22 digits; any digit sequence can be entered. Special characters, i.e. asterisk and hash, are also allowed as part of the destination number. For automatic suffix dialing it is possible to specify the number of digits that have to be transmitted with a delay, e.g.: unabbreviated call number 0897220 SUPDIAL=1 will dial 089722 immediately and the last 0 only if no suffix dialing followed the SPDI dialing.