Resolution
Changing the number of times a Cisco IP Phone rings before forwarding to voice mail or another station is easily accomplished by changing a service parameter.
- From the Cisco CallManager Administration web pages, select Service > Service Parameters.
- Select Cisco CallManager from the list and then choose the Cisco CallManager service from the list on the left.
The parameter that needs to be changed is titled Forward No Answer Timeout. By default, it has a value of 12 seconds. A typical ring cycle is approximately 4 seconds.
Note: This is a global parameter, so changing this value will affect the behavior of all phones. When changing this value be sure to do so for all CallManagers in the cluster.
Cisco CallManager 4.2(3) allows you to set this parameter on a per line basis. The field name is No Answer Ring Duration.
For more details, please refer to Cisco 7900 IP Phone FAQs.
Voicemail Problems
Voicemail behavior problems
Supplementary Services
Call forward no answer (CFNA)