12. Appendix
12.1
SSI & TSI Dialing Rules
In the TETRA system, subscribers are distinguished by different identities. Each subscriber is assigned
with a unique short subscriber identity (SSI), which serves a part of the TETRA subscriber identity (TSI).
And TSI is generally composed in this way: Mobile Country Code (MCC) + Mobile Network Code (MNC)
+ SSI. To initiate an individual call, please dial the SSI or TSI in compliance with the rules below.
z
SSI Dialing: Make sure there are not more than 8 digits.
z
TSI
Dialing
¾
MNC+SSI: 1) Input the MNC as it is; 2) SSI must be 8 digits long. Add 0 before the first digit of
SSI which is shorter than 8 digits. For example, when MNC is 20 and SSI is 504, you need to
input 2000000504.
¾
MCC+MNC+SSI: 1) MCC must contain 3 digits. Add 0 before the first digit of MCC which is
shorter than 3 digits; 2) MNC must contain 4 or 5 digits. When the MNC is shorter than 4 digits,
add 0 before its first digit; when it is 5 digits long, use it directly; 3) SSI must be 8 digits long. Add 0
before the first digit of SSI which is shorter than 8 digits. For example, when MCC is 460, MNC is
20 and SSI is 504, you need to input 460002000000504.