300-085 · Question #14
An IP phone user reports that they are unable to set the Call Forward All feature on their phone. The user reports that they press the CfwdAll softkey and enter the desired telephone number, but the…
The correct answer is D. The Call Forward All option of the IP phone does not have a CSS defined. When an IP phone cannot accept a Call Forward All destination, the most likely cause is that no Calling Search Space (CSS) is assigned to the Call Forward All field on the directory number configuration.
Question
An IP phone user reports that they are unable to set the Call Forward All feature on their phone. The user reports that they press the CfwdAll softkey and enter the desired telephone number, but the phone does not accept it. What could be causing this issue?
Options
- AThe user is entering too many digits for the destination number.
- BCisco Unified Communications Manager does not control Call Forward.
- CThe Call Forward All service parameter is not enabled.
- DThe Call Forward All option of the IP phone does not have a CSS defined.
- EThe Call Forward All enterprise parameter is not enabled.
How the community answered
(26 responses)- A15% (4)
- B8% (2)
- D73% (19)
- E4% (1)
Why each option
When an IP phone cannot accept a Call Forward All destination, the most likely cause is that no Calling Search Space (CSS) is assigned to the Call Forward All field on the directory number configuration.
Digit count alone does not cause CUCM to reject a CfwdAll destination; routing is controlled by CSS and partition membership, not digit length.
CUCM fully controls Call Forward features for IP phones registered to it; it is the authoritative system for call forwarding logic.
There is no CUCM service parameter specifically named 'Call Forward All' that enables or disables the CfwdAll softkey function globally.
In Cisco Unified Communications Manager, the Call Forward All field on a directory number has its own CSS setting that governs which partitions the forwarded destination can be routed to. If this CSS is empty or does not include the partition of the target number, CUCM will reject the forwarded destination even if the user's device CSS can reach it. This is a common misconfiguration that causes the phone to appear to ignore the CfwdAll entry.
There is no CUCM enterprise parameter named 'Call Forward All' that must be enabled for the feature to function on individual phones.
Concept tested: Call Forward All CSS configuration in CUCM
Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1/systemConfig/cucm_b_system-configuration-guide-1251/cucm_b_system-configuration-guide-1251_chapter_01001.html
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