Siemens optiPoint 410 entry Administrator's Manual page 234

Troubleshooting
No DHCP Server
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No Server Set
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No Registrar Set
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No Sip Gateway Set
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No Name Set
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No Terminal address set
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No SIP Password
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234
Ensure that the phone's DHCP setting is correctly configured
! page 175.
Check the phone's VLAN ID is correct ! page 203. If the phone's VLAN
is provided by DHCP check that the phone successfully discovers a
VLAN on start-up.
Ensure that the DHCP server is on the same VLAN as the phone.
Confirm the L2 QoS settings are correctly configured ! page 193 and
match those configured in network components.
Check that the DHCP Server is active and correctly configured and has
enough free leases.
Check the configuration of the network switch's port which the phone
is connected to. If the network is using VLANs ensure that the switch's
port is configured for the same VLAN as the phone.
Ensure that the both the SIP Server and SIP Registrar addresses are
correctly configured ! page 214.
Ensure that the SIP Registrar address is correctly configured
! page 214.
Ensure that the SIP Gateway address is correctly configured
! page 214.
Ensure that the Terminal Name is correctly configured ! page 222.
Ensure that the "Register By Name" setting ! page 210 is correct. This
should be "On" if the phone is using the Terminal name and "Off" if the
phone is using the Terminal Number.
Ensure that the Terminal Number is correctly configured.
Ensure that the Register By Name setting is correct. This should be
"On" if the phone is using the Terminal Name and "Off" if the phone is
using the Terminal Number.
Ensure that the SIP Password is correctly configured ! page 215.