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:

BlocksCharacter RangeAdded in Unicode VersionDocumentation
Telugu 0C00..0C7F 1.0  U0C00.pdf

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:

CharactersUnicode VersionDocumentation
0C00 7.0  WG2 N3964,  L2/10-392
0C34 7.0  WG2 N4214,  L2/12-015,  L2/12-076
0C3D 5.1  n3116R.pdf/ L2/06-250
0C58..0C59 5.1  n3116R.pdf/ L2/06-250
0C62..0C63 5.1  n3116R.pdf/ L2/06-250
0C78..0C7F 5.1  n3116R.pdf/ L2/06-250
0C5A 8.0  L2/13-121

Documentation refers to  ISO Working Group and Unicode proposals

A number of proposals for its inclusion have been submitted to the Unicode Technical Committee and WG2:

2000-11-15 Unicode representation of Indian Scripts — M.N. Cooper ( L2/00-417)

2004-03-09 Indic scripts collation grouping; CTT suggestion — Kent Karlsson ( WG2 2716.doc,  L2/04-109)

2004-06-30 Proposal on Clarification and Consolidation of the Function of ZERO WIDTH JOINER in Indic Scripts — Peter Constable ( L2/04-279)

2004-08-04 Response to Public Review Issue #37 — Antoine Leca ( L2/04-328)

2005-01-29 Comments on PRI 59: Script Specific Danda and Double Danda — Eric Muller ( L2/05-055)

2005-02-07 Issues in Representation of Indic Scripts in Unicode (Unicode Conference Presentation) — Om Vikas ( L2/05-063)

2006-04-17 Dravidian script "markers" code-points in Unicode — Naga Ganesan ( L2/06-134)

2006-06-17 Comments on Indic Block Descriptions — Peter Constable ( L2/06-225)

2006-07-31 Comments on L2/06-250, Proposal to add eighteen characters for Telugu to the BMP of the UCS — Naga Ganesan ( L2/06-267)

2006-08-01 Proposal on Handling Reph in Gurmukhi and Telugu Scripts — Nagarjuna Venna ( L2/06-334)

2006-08-02 Proposal to add eighteen characters for Telugu to the BMP of the UCS — Michael Everson, Sures Kolicala, and Nagarjuna Venna ( WG2 N3116,  L2/06-250)

2008-03-02 Criteria for the encoding of script-specific dandas — Unicode and US National Body ( WG2 N3457,  L2/08-118)

2009-05-08 Deprecated Telugu and Malayalam reph sequences — Naga Ganesan ( L2/09-203)

2009-11-01 Request for an annotation for the generic Indic dandas — Shriramana Sharma ( L2/09-423)

2010-09-06 Request to avoid encoding South Indian abbreviation signs — Shriramana Sharma ( L2/10-266)

2010-09-12 Request to deprecate 0C55 TELUGU LENGTH MARK — Shriramana Sharma ( L2/10-339)

2010-10-11 Request to encode South Indian candrabindu-s — Shriramana Sharma ( WG2 N3964,  L2/10-392)

2011-07-28 A clear policy on encoding OM characters — Shriramana Sharma ( L2/11-308)

2011-10-14 On the Telugu nakaara-pollu — Shriramana Sharma, Suresh Kolichala, Nagarjuna Venna, Vinodh Rajan ( L2/11-409)

2011-10-27 Letter from Swaran Lata, Gov't of India, re proposals — Swaran Lata ( L2/11-408)

2012-01-17 Proposal to encode 0C34 TELUGU LETTER LLLA — Shriramana Sharma, Suresh Kolichala, Nagarjuna Venna, Vinodh Rajan ( WG2 N4214,  L2/12-015)

2012-01-17 Request to finalize encoding model for Telugu Reph — Shriramana Sharma ( L2/12-017)

2012-01-18 Proposal to encode 0C5A TELUGU LETTER RRRA — Shriramana Sharma, Suresh Kolichala, Nagarjuna Venna, Vinodh Rajan ( WG2 N4215,  L2/12-016)

2012-02-06 Govt. of Andhra Pradesh's inputs on document no. L2/12-015 (Telugu LLLA) — Andhra Pradesh ( L2/12-076)

2012-02-06 Govt. of Andhra Pradesh's inputs on document no: L2/12-017 (Telugu Reph) — Andhra Pradesh ( L2/12-077)

2012-02-07 Inputs of Govt. of India on various documents — Swaran Lata ( L2/12-079)

2012-07-31 Indic Scripts in Unicode — Eric Muller ( L2/12-289)

2013-01-28 Request to use character name TTTA - Comment on L2/12-016 — Naga Ganesan ( L2/13-034)

2013-05-09 Letter from Andhra Pradesh re Telugu RRRA — Suresh Kolichala ( L2/13-121)

2013-11-07 Samples for usage of dandas in Gujarati, Telugu, Kannada, Malayalam, and Tamil — Roozbeh Pournader ( L2/13-224)

2013-11-09 The Kannada "nakaara-pollu" — Shriramana Sharma ( L2/13-228)

2014-01-05 On the Telugu and Kannada Vowel Signs for O and OO — Shriramana Sharma ( L2/14-005)

2014-08-05 Status report on Script Extensions and Indic properties — Roozbeh Pournader ( L2/14-199)

2015-02-16 Need for representing often used Telugu symbols — Challa Anilkumar ( L2/15-082)

2016-10-20 Proposal to encode the TELUGU SIGN COMBINING ANUSVARA ABOVE — Srinidhi A, Sridatta A ( L2/16-285)

Recommendations to UTC #149 November 2016 on Script Proposals ( L2/16-342) (See point 3.)

UTC #149 Minutes ( L2/16-325) (See D.3 for decision and action items)

2017-04-17 Request for editorial updates to Indic scripts — Srinidhi A, Sridatta A ( L2/17-098)

Recommendations to UTC #152 July-August 2017 on Script Proposals ( L2/17-255) (See point 7.)

2017-07-17 Proposal to encode the TELUGU SIGN SIDDHAM — Srinidhi A, Sridatta A ( L2/17-218)

Recommendations to UTC #152 July-August 2017 on Script Proposals ( L2/17-255) (See point 12.)

UTC #152 Minutes ( L2/17-222) (See D.13 for decision and action items)