You cannot add "Cisco Catalyst 9200 - Network Essentials - switch - L3 - Managed - 48 x 10/100/1000 - rack-mountable" to the basket because the product is out of stock.
Cisco IP Phone 8821 – Cordless extension handset – with Bluetooth interface – IEEE 802.11a/b/g/n/ac (Wi-Fi) – SIP – 6 lines