No Output Variable In Remote Procedure Call?

I'm calling a procedure on a remote Server (local SQL2005, remote SQL2005) and I need the return value.

Local:
declare @value int execute ('exec mbtest1.dbo.psybcis ?', @value OUTPUT) at [REMOTESQLSERVER] select @value

Remote:
create procedure [dbo].[psybcis] (@value int OUTPUT) as begin select @value = '13' end


I do not get a value in the OUTPUT variable - just NULL. Documentation says:
Execute a pass-through command against a linked server
{ EXEC | EXECUTE } ( { @string_variable | [ N ] 'command_string [ ? ] ' } [ + ...n ] [ { , { value | @variable [ OUTPUT ] } } [ ...n ] ] ) [ AS { LOGIN | USER } = ' name ' ] [ AT linked_server_name ] [;]
There is an OUTPUT parameter, but how does it work? Is my syntax wrong?


It works when using following syntax,
declare @value int exec [REMOTESQLSERVER].mbtest1.dbo.psybcis @value OUTPUT select @value
but I need to use this procedure call in a distributed transaction to a Sybase ASE server and this syntax is not allowed for cross-system-calls.
So first I want to get it work from SQL2005 to SQL2005.