Booking Visa Appointment in a different consulate

[kalyanichandar]

Hi,
I want to book visa appointment for my parents' visitor visa. They currently live in Gujarat and I want to schedule the appointment in Chennai.
I have been hearing varied responses
- Few say they should go for interview only in the consular office that belongs to the state they have been living in the past 6 months,
- Few say there is no such restriction.
Has any one done the visa appointment in the consulate different than the one that belongs to the state of residency and obtained their visa?

Thanks,
Chandar