In The Unicode Standard, Telugu script implementation is discussed in Chapter 12 South and Central Asia-I: Official Scripts of India.
The Telugu script was first encoded in The Unicode Standard version 1.0. Since that time the encoding has undergone a small number of modifications; the script is encoded in the following block:
|Blocks||Character Range||Added in Unicode Version||Documentation|
Vedic Extensions may be used with the Telugu script as well as many other Indic scripts.
Subsequent to version 1.0, the following characters have been added to the Telugu script:
Documentation refers to ISO Working Group and Unicode proposals