Cisco 7800 Series Administration Manual page 45

Set NTP Server Fields
Procedure
Step 1
Press Applications
Step 2 Select Admin Settings.
Step 3 Scroll to Network Setup, select NTP Server.
Step 4
Press Edit and enter the new NTP Server IP Address.
Step 5 Press Validate, and then press Apply to apply the changes.
Step 6 Press Erase to erase the Trust List or press Continue to continue applying changes without erasing the Trust
List.
Step 7 If multiple NTP Servers can be configured, repeat Steps 4 and 5 as needed to assign backup NTP Servers.
Verify Phone Startup
After the Cisco IP Phone has power connected to it, the phone automatically cycles through a startup diagnostic
process.
Procedure
Step 1
If you are using Power over Ethernet, plug the LAN cable into the Network port.
Step 2 If you are using the power cube, connect the cube to the phone and plug the cube into an electrical outlet.
The buttons flash amber and then green in sequence during the various stages of bootup as the phone checks
the hardware.
If the phone completes these stages successfully, it has started up properly.
Configure the Voice Codecs
A codec resource is considered allocated if it has been included in the SDP codec list of an active call, even
though it eventually might not be chosen for the connection. If the G.729a codec is enabled and included in
the codec list, that resource is tied up until the end of the call whether or not the call actually uses G.729a. If
the G729a resource is already allocated (because only one G.729a resource is allowed per IP phone), no other
low-bit-rate codec can be allocated for subsequent calls. The only choices are G711a and G711u.
Negotiation of the optimal voice codec sometimes depends on the ability of the Cisco IP Phone to match a
codec name with the far-end device or gateway codec name. The phone allows the network administrator to
individually name the various codecs that are supported such that the correct codec successfully negotiates
with the far-end equipment.
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Cisco IP Phone 7800 Series for Third-Party Call Control Administration Guide
Verify Phone Startup
31