it is rvsm airspace. initiate descent and give a call on mumbai hf frequencies or if unable, mumbai 132.7 if north of p574 and 125.35 p574 and south of it, ask for a relay and you can expect a lower level and direct BBB once clear of conflicting traffic. the same goes for muscat control if heading in that direction.
sureshot hf frequencies are 8879, 10018 during day and 3467, 5658 during night time.