D-Link DPH-150S - Manual (Page 42)

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(PhoneB) became disabled on
the network so that I can not get
VoIP services. What can I do to
fix it?
Then, the PhoneB will automatically start to get the VoIP connection and
the associated VoIP services.
It is because that in the factory default settings the DPH-150S has an
integrated DHCP server to assign the IP address of the LAN port with
the IP segment of “192.168.15.xxx”.
That is, for this kind of connection of PhoneA & PhoneB (the WAN port
of PhoneB is connected with the LAN port of PhoneA), the WAN port &
the LAN port of PhoneB will be in the same IP segment
(192.168.15.xxx), which will get the system of PhoneB confused so as to
become disabled on the network. For this reason, we should change the
IP segment of the PhoneA LAN port.