Careful: Indian visas begin to expire from the date of issue, not the date of entry, i.e. you have to leave India 6 months after your visa was issued.
Different embassies handle visas differently. In Ankara, the Pakis demand a letter of non-objection from your embassy. The Germans refuse to deliver this and I have heard the same from some other countries, like Italy. Check with Oz Foreign Affairs as to how they handle this. In Dubai the German embassy gave me the required letter (a typical case of the left not knowing what the right is doing, but lucky for me). But getting Pak and India visas there is a pain. Iranian visas, however, are dead easy and efficient there.