Is there two version of ulaw and alaw encoding in audio compression? I am new to encoding in audios and i have searched for ulaw and alaw and found there is conversion from audio to this encoding CCITT alaw/ulaw and as i have known alaw/ulaw belongs to ITUT group not CCITT so Is there two standards for conversion audio to  alaw/mulaw ?

and this conversion about CITT ulaw
Yes. You can choose the µ parameter freely in µ-law encoding. So, there's as many different µ-law encodings as there are possible µ; of course, only very few are standardized.
The same applies to the A in A-law.
You might want to read the wikipedia articles on µ-law and A-law, instead of just the G.711 article.