Cisco Systems ATA187I1ARF Manual Do Utilizador

In most cases, a phone will restart if it powers up by using external power but loses that connection and 
switches to PoE. Similarly, a phone may restart if it powers up by using PoE and then gets connected to 
an external power supply.

 provides troubleshooting information for the security features on the ATA 187. For 

information relating to the solutions for any of these issues, and for additional troubleshooting 
information about security, see the Cisco Unified Communications Manager Security Guide.

 provides general troubleshooting information for the ATA 187.

Device authentication error.

CTL file does not have a 
Cisco Unified Communications Manager 
certificate or has an incorrect certificate.

Phone cannot authenticate CTL file.

The security token that signed the updated CTL 
file does not exist in the CTL file on the phone.

Phone cannot authenticate any of the configuration 
files other than ITL file.

The configuration file may not be signed by the 
corresponding certificate in the phone’s Trust List.

Phone does not register with 
Cisco Unified Communications Manager.

The CTL file does not contain the correct 
information for the 
Cisco Unified Communications Manager server.

Phone does not request signed configuration files. The CTL file does not contain any TFTP entries 

with certificates.

Daisy-chaining phones

Cisco does not support connecting a phone to another phone through 
the PC port. Each phone should directly connect to a switch port. If 
phones are connected together in a line (by using the PC port), the 
phones will not work.

Poor quality when calling mobile 
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 a phone and a mobile phone will have 
poor voice quality. Use G.729 only when absolutely necessary.