Odia is one of classical language has history over 2000-3000 of years. Started from Kalinga which was situated in Simhanchalam or as like as not in north Andhra Pradesh which once back in past occupied 80-90 percent of the present India and re-situated their capital to Cuttuck. It was attacked by many realms like British, Mughal and Magadha but people of orissa remain as it is now. This is the reason Odia has many different dialects.

As you an Odia know Odia has many different dialects northern districts speaks their own language so as Southern & Westnern district but can you discern it with Standard or Genaral Odia ? Entire world would devote more than everytime if anyone does. No one notices why say "Cha" "Chha" & "Sa". Chha is used in the standard Odia while "Cha" & "Sa" are being used as it were former and hold cultural value or maybe people don't learn proper odia because the government education system and lack of schools.

This all "Chha, Cha & Sa" is produced using the same method by touching the tongue on upper teeth. Jya & Ja and Jha are also produced using the same method but they are voiced not aspirated. Above given examples are not enough to distinguish there are more than it which you can get from this website.

Standard Odia is the language which whole Odisha fought for, became united to fight against bengal presidency and ancient state united again with slightly different pronunciation because Ganjam was in the Madras presidency, Sambalpur was in central hindi speaking presidency which was captured from Odisha by Britishers after Maratha & Mughal incursion.