====== 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.

===== Enhanced =====
See ETSI 03.40