"Triangle with an Exclamation Point on the screen" error indicates the same underlying issues that cause "URL Calling is Disabled".
- This error message is what Polycom phones show when they have firmware 18.104.22.16862 or higher.
- The older firmware 4.0.1.xxxx only showed URL Calling Is Disabled.
What The Errors Mean:
- The phone(s) do have an IP address, which means they are wired correctly.
- However, the phones cannot reach our registration servers (usbc.accessline.com), usually due to a DNS-timeout or other LAN-related issue.
- 80% of the time the issue is caused by the DHCP DNS servers taking too long to forward the Polycom's phones DNS lookup requests, causing the phones to timeout and give up on trying to resolve the Intermedia domain names to the server IP addresses
- 5% of the time the issue is due to wireless interference when phones are using wireless adapters
- 5% of the time it's due to a DHCP Race Condition
- 3% of the time it's due to a Broadcast Storm, which is usually caused by a miswired/looped network cable.
- 3% of the time the issue is due an router/firewall interfering blocking the phones' Keep-Alive/NAT-Binding messages that keep the phone's connection open through the customer's firewall
- 1% of the time it's due to there being too much packet loss and/or delay on the customer's internet connection, causing the phone's DNS lookups and other connections to timeout
- 1% of the time it's due to the customer entering in the wrong Default Gateway IP Address and/or Subnet Mask on their DHCP Server
- 1% of the time it's due to the customer using an uncommon DHCP Server Option
- 1% of the time it's due to another strange local network or ISP issue. See KB# 3003 for details.