An electron transporting layer is a cured layer including carbon atoms, nitrogen atoms and oxygen atoms. Compressed data is received and decoded. The gateway responds by signalling the unavailability of the P-CSCF to user equipment, which was associated with the P-CSCF during a previous registration with the IMS network. Each section includes precut slots, tabs and hinges that act as folding guides, allowing the blank to easily fold into a structure defining an enclosure like the birdhouse. The top cap first and second end portions are removably mountable to the outer end plate of a one of the sector assemblies and the outer end plate of an adjacent sector assembly, respectively.