sagem box is not compatible with nokia remote unfortunately - you can get universal and all-in-one remotes but the codes for them vary, and not all of them work. have a search on the site for a few examples of what remotes people have got working.
for now tho, you can use remote control emulation software on the PC to simulate a dbox remote - again, search and ye shall find. I posted details on it a few days ago.
Liam.