CCSID & ENCODING

I got probably problems with CCSID and Encoding.
The workflow is:
Step_1:
- ASP.NET WebService (hosted in Windows XP) posts a message in queue_A of queueManager with CCSID 1208 on MQ installed in HP-UX 11.31 v2, LC_CTYPE=univ.utf8.

Step_2:
- application_X hosted in the same HP-UX server Gets the message from queue_A through JAVA library. (local development)

Step_3:
- message processed

Step_4:
- application_X Posts the reply(the same message string) to queue_B

Step_5:
- ASP.NET WebService Gets the message from queue_B.

The following happens:
- In Step_4 as message Posted, its length changes. (probably due CCSID conversions)
- In Step_5 as message retrieved by ASP.NET WebService, the message aint readable.

Would be pleased if someone would point to some comprehensive documentation on CCSID and Encoding settings.
Or, what would be the right values in all parties for CCSID and Encoding?