error when execute stored procedures.

Hi! people
When you run a procedure with parameters the server gets sick .. ex:

$ a = mssql_query ( "EXEC sp_some 'a', 'b'");

Now if I run the following procedure without parameters

$ a = mssql_query ( "exec sp_configure");

does not give any error ...

the first procedure the probe in queryAnalizer and works perfect .....

any suggestions
greetings