So nearly there...
SELECT
calldate,
Overall= SUM(talktime),
A_Talktime= SUM(case when ID = 1 then talktime END),
B_Talktime= SUM(case when ID = 2 then talktime END),
C_Talktime= SUM(case when ID = 3 then talktime END)
FROM #temp
GROUP BY calldate
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden