Hi there,
Q. Are you only planning on being in India for a month?
If you are planning to be outside of Canada while your application is being processed it’s best to apply under the outland class.
However, the sponsor needs to be in Canada (if applying under the in-Canada class). In this case, send application to Mississauga.
or
if the sponsor is not planning to be in Canada (the outland class or in-Canada class with outland processing) show beyond a doubt that both of you plan to move back once you get your PR. In this case, send application to Sydney office.
If you are only planning on being away for a short while & the PA has authorization to return to Canada - apply under the inland class.
But please do more research and ask (on these forums) people who have undergone the outland process where both the sponsor & PA have been out.
And sorry if I confused you even more