A network switch includes a plurality of egress ports configured to send packets of data traffic to at least one receiving network device and a plurality of ingress ports configured to receive the packets of data traffic from at least one sending network device. The agricultural compositions are prepared by a process comprising mixing together a carrier, such as a solid fertilizer or liquid solvent, and a carbohydrate-based surfactant, such as AGRIMUL PG 2069. A polyurethane foam plastic is filled between the interior wall board and he exterior wall board. The call can then be extended from the prepaid server platform to a PTT switch for establishing communication with one or more selected contacts in a contact list, based on translation of the contact number to one or more destination telephone numbers for the called contact.