Description: 
          The usSrxReasonTable stores the information for the creation
           of Reason Header including causes for the SIP and Q.850 protocols,
           and also some predefined and user-defined ones.

Restrictions:
Reason Type  | Id                     | Type                
             | Access    | Values     | Access      | Values  
-------------+-----------+------------+-------------+--------             
Q.850        | read-only | 1..127     | read-create | 1       
SIP          | read-only | 300..699   | read-create | 2       
Pre-defined  | read-only | 1000..1999 | read-create | 3       
User-defined | read-only | 2000...    | read-create | 4       
             
Reason Type  | Prim cause             | Prim text              
             | Access      | Values   | Access     | Values     
-------------+-------------+----------+------------+-----------            
Q.850        | read-create | =Id      | read-write | 0-32 char  
SIP          | read-create | =Id      | read-write | 0-32 char  
Pre-defined  | read-write  | 300..699 | read-write | 0-32 char  
User-defined | read-write  | 300..699 | read-write | 0-32 char  
              
Reason Type  | Sec cause           | Sec text                                                     
             | Access     | Values | Access     | Values                                
-------------+------------+--------+------------+------------------------------------             
Q.850        | read-write | >=0    | read-write | (SecCause!=0)?(0-32 char):(0 char)
SIP          | read-write | >=0    | read-write | (SecCause!=0)?(0-32 char):(0 char)
Pre-defined  | read-write | >=0    | read-write | (SecCause!=0)?(0-32 char):(0 char)
User-defined | read-write | >=0    | read-write | (SecCause!=0)?(0-32 char):(0 char)