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Chapter 9 Troubleshooting and Maintenance
General Troubleshooting Tips
9-16
Cisco Unified IP Phone 7970G/7971G-GE for Cisco Unified Communications Manager 6.0
OL-12232-01
General Troubleshooting Tips
Table 9-2 provides general troubleshooting information for the Cisco Unified IP
Phone.
Table 9-2 Cisco Unified IP Phone Troubleshooting
Summary Explanation
Daisy-chaining IP
phones
Daisy chaining (connecting an IP phone to another
IP phone through the access port) is not supported.
Each IP phone should directly connect to a switch
port.
Poor quality when
calling digital cell
phones using the G.729
protocol
In Cisco Unified Communications Manager, you can
configure the network to use the G.729 protocol (the
default is G.711). When using G.729, 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 cause IP phones
to reset, or be unable to
make or answer a call
A prolonged Layer 2 broadcast storm (lasting several
minutes) on the voice VLAN may cause IP phones to
reset, lose an active call, or be unable to initiate or
answer a call. Phones may not come up until a
broadcast storm ends.
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