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5215 and 5220 IP Phone SIP User and Administrator Guide
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Appendix C — Troubleshooting
This section contains troubleshooting information about
• Phones working behind a non-SIP compliant router.
• Phone error messages.
• Maintenance logs.
• Call statistics to remotely debug audio problems.
• Time and date correction on your phone.
• Mirroring LAN and PC ports.
• Pinging an IP address.
• Performing a DHCP trace.
• Diagnostics (i.e. errors or “asserts”).
Phones Working Behind a Non-SIP Compliant Router
The following table presents a solution to your phone not working behind a non-SIP compliant
router:
Table 7: Non-SIP Compliant Router
Problem Solution
5215 or 5220 IP Phone does not seem to
work behind a non-SIP compliant router.
Follow the steps in the Working with Firewalls topic
in the Web Configuration Tool online Help -
Administrator. To access the Help, see Supporting
Documentation on page 2.