Hi Vani,
"BSP cant be used or send to the external customers to capture the response. Therefore here we need to use the HTTP/HTTPS."
With BSP you can send URL to external customers!! Only the thing is you must put ## at the end of the URL. Are you doing this?
I am not finding any reasons for failure. Also go through below config guide and check if the steps that you are following are correct.
C22_BB_ConfigGuide_EN_DE.doc
Rgds
Hari