| Appendix A | |
|
| |
Image update failed. If | • Check the IP 720 phone’s IP address, network, | |
setting Boot Download | default gateway settings. | |
to Yes, after the phone | • Check the network connection. | |
reboots and if the setting | ||
• Check the TFTP server IP address and make sure the | ||
still says Yes, the boot | ||
failed. | TFTP server is running. | |
| • PING from the TFTP server to the IP 720. | |
|
| |
IP phone registered then | • Check network connectivity by pinging from | |
goes back to Basic mode | AltiServ to the IP phone. | |
| • Check if IP Phone Service is running. | |
| • Check if there is a duplicate IP address by | |
| unplugging the Ethernet cable on the IP phone, then | |
| pinging the IP 720 phone’s IP address. | |
| • Check the extension’s IP address in | |
| MaxAdministrator to find out if another user is | |
| trying to log in using the same extension number. | |
| • Use #27 then Enter to log in again and see if the | |
| problem persists. | |
|
| |
No IP Address | • Check if DHCP is enabled. If YES, check network | |
| connection. If NO, verify your DHCP server is | |
| correctly configured. | |
| • Check if IP 720 phone’s IP address is configured. | |
|
| |
One way connection | • Make sure firewall setting has all the TCP/UDP | |
| ports required by MAXCS opened. | |
|
| |
Phone does not show | • Check the power source to be sure the IP 720 phone | |
anything on LCD display | is receiving power. | |
|
| |
Poor voice quality | • Make sure a switch is used, rather than a hub, in the | |
| corporate LAN. | |
| • G.711 provides better voice quality. | |
| • If VoIP is set up over WAN, set priority queuing on | |
| the WAN router. | |
| • Make sure WAN QoS is okay by pinging a few | |
| hundred packets from remote site and observe | |
| packet loss and network latency. | |
| • Adjust jitter buffer to accommodate network | |
| latency. | |
|
|
IP 720 User Manual 35