Dear, Raja! Any VPLMN has its own routeing scheme. And if there is no CAMEL agreements between HPLMN and VPLMN operators then VPLMN will route such call according to its own routeing scheme. In Camel case CAMEL SCP substitutes the original dialed short code with service centre directory number in international format. After that the call is established to HPLMN Service Centre.