Cisco CP-7911G Administration Guide - Page 236
General Troubleshooting Tips
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General Troubleshooting Tips Chapter 9 Troubleshooting and Maintenance General Troubleshooting Tips This section provides troubleshooting information for some common issues that might occur on the Cisco Unified IP Phone. Table 9-2 provides general troubleshooting information for the Cisco Unified IP Phone. Table 9-2 Cisco Unified IP Phone Troubleshooting Summary Daisy-chaining IP phones. Poor quality when calling digital cell phones using the G.729 protocol. Prolonged broadcast storms cause IP phones to re-register. Explanation Do not connect an IP phone to another IP phone through the access port. Each IP 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. 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 (lasting several minutes) on the voice VLAN cause the IP phones to re-register with another Cisco Unified Communications Manager server. 9-16 Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 6.0 OL11954-01