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Cisco Unified IP Video Phone 7985G Administration Guide
OL-8726-02
Chapter 9 Troubleshooting and Maintenance
General Troubleshooting Tips
Step 5
From Cisco Unified CallManager, choose
Device > Phone
and verify that you
assigned the correct MAC address to this Cisco Unified IP Phone. To verify the
MAC address on the phone, choose
Settings >
Network Configuration
and scroll
to the
MAC address
option.
Step 6
Power cycle the phone.
General Troubleshooting Tips
Table 9-1
provides general troubleshooting information for the Cisco Unified IP
Video Phone.
Table 9-1
Cisco Unified IP VIdeo Phone Troubleshooting
Summary
Explanation
Daisy-chaining Cisco Unified IP
Video Phones.
Do not connect a Cisco Unified IP Video Phone to another
Cisco Unified IP Video Phone through the access port. Each
Cisco Unified IP Video Phone should directly connect to a
switch port. If you connect IP phones together in a line
(daisy-chaining), a problem with one phone can affect all
subsequent phones in the line. Also, all phones on the line share
bandwidth.
Poor quality when digital cell phones
are called by using the G.729
protocol.
In Cisco Unified CallManager, you can configure the network
to use the G.729 protocol (the default is G.711). When G.729 is
used, calls between an IP phone and a digital cellular phone will
have poor voice quality. Use G.729 only when absolutely
necessary.
Prolonged broadcast storms causing
IP phones to reregister
Prolonged broadcast storms (lasting several minutes) on the
voice VLAN cause the IP phones to reregister with another
Cisco Unified CallManager server.
