Getting Started15Connecting the Optional Expansion PSTN Box CPN10You can connect optional expansion PSTN box CPN10 to make calls using the Public SwitchedTelephone Network (PSTN).To connect the expansion PSTN box:1. Insert the USB plug on the expansion PSTN box into the USB port on the phone.NotePhone InitializationAfter your phone is powered on, the system boots up and performs the following steps:Automatic Phone InitializationThe phone finishes the initialization by loading the saved configuration. The touch screendisplays “Initializing…” during the initialization.DHCP (Dynamic Host Configuration Protocol)The phone attempts to contact a DHCP server in your network to obtain valid IPv4 networksettings (e.g., IP address, subnet mask, default gateway address and DNS address) by default.NotePhone StatusYou can view phone status via phone user interface or web user interface.Available information of phone status includes: Network status (IPv4 status or IPv6 status, IP mode and MAC address).- IPv4 uses a 32-bit address.- IPv6 is an updated version of the current Internet Protocol to meet the increaseddemands for unique IP addresses, using a 128-bit address.If you need to record calls when using the PSTN box, you can also connect the USB flash drive tothe USB port on the PSTN box. Up to two expansion PSTN boxes can be connected to an IPconference phone. For more information, refer toYealink PSTN Box CPN10 Quick Start Guide.If your network does not use DHCP, proceed to Basic Network Settings on page 17.
