B747-400
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 120; Flight Crew Total 20000; Flight Crew Type 8000
ATC Issue All Types
General None Reported / Taken
Procedure; Aircraft; ATC Equipment / Nav Facility / Buildings
At cruise FL320.  Received CPDLC message from PAZN to contact Anchorage Center 132.85.  Multiple attempts were made with no success; while passing within 20 miles south [of] CDB.  Multiple other aircraft all seemed to have the same difficulty.  Contact was maintained with PAZN CPDLC at all times.
A B747-400 Captain reported difficulty contacting Anchorage Center when directed by CPDLC message. Reporter noted several other aircraft had the same problem.