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SMS-PDU
Validity Period (TP-VP)
Validity period specifies the time when SM expires. If SM is't
delivered before that moment, it is discarded by SC. Validity-Period can
be in three different format; Relative, Absolute and Enhanced.
Relative:
The TP-Validity-Period comprises 1 octet in integer representation, giving the length of the validity period, counted
from when the SMS-SUBMIT is received by the SC.
The representation of time is as follows:
| TP-VP value | Validity period value |
| 0 to 143 | (TP-VP + 1) * 5 minutes (i.e. 5 minutes intervals up to 12 hours) |
| 144 to 167 | 12 hours + ((TP-VP - 143) * 30 minutes) |
| 168 to 196 | (TP-VP - 166) * 1 day |
| 197 to 255 | (TP-VP - 192) * 1 week |
Absolute
TP-VP field is 7 octets long, containing
TP-SCTS
formatted time when SM expires. See ETSI 03.40 for more information.
