Hi Raghu,
If we used party object, it has provision to define AS2 ID and AS2 name as party ID. Please refer the below screenshot from the blog
http://scn.sap.com/servlet/JiveServlet/showImage/38-88513-244561/pastedImage_5.png
I am not aware if there is any place to define as2 name in the channel.
regards,
Harish