The Do Not Disturb (DND) feature allows phone users to disable audible ringing for incoming calls. When DND is enabled, incoming calls do not ring on the phone, however there is visual alerting and the call information displays, and a call can be answered if desired. When a local IP phone calls another local IP phone that is in the DND state, the message “Ring out DND” displays on the calling phone indicating that the target phone is in the DND state.
Phone users can toggle DND on and off by using the DND soft key in the idle or ringing call states. A SSCP phone user can toggle DND on or off in the ringing state only if DND in not already active on the phone. If DND is already active when a new call comes in, the SCCP phone user cannot change the DND state by pressing the DND soft key.
If an SSCP phone user toggles DND on during an incoming call, the DND state remains active for the current call only. If a SIP phone user toggles DND on during an incoming call, the DND state remains active during the current call and for all future calls until the user explicitly toggles DND off.
Pressing the DND soft key during an incoming call forwards the call to the call-forward no answer destination if Call Forward No Answer is enabled. If Call Forward is not enabled, pressing the DND soft key disables audible ringing and visual alerting, but the call information is visible on the phone display.
In Cisco CME 3.2.1 and later versions, DND can be blocked from phones with the feature-ring function. A feature ring is a triple-pulse ring, a type of ring cadence in addition to internal call and external call ring cadences. For example, an internal call in the United States rings for 2 seconds on and 4 seconds off (single-pulse ring), and an external call rings for 0.4 seconds on, 0.2 seconds off, 0.4 seconds on, and 0.2 seconds off (double-pulse ring).
The triple-pulse ring is used as an audio identifier for phone users. For example, each salesperson in a sales department could have an IP phone with a button sharing the same set of ephone-dns with the sales staff and another button for their private line for preferred customers. To help a salesperson identify an incoming call to his or her private line, the private line can be configured with the feature-ring function. You can disable the DND function on feature-ring lines. In the preceding example, salespeople could activate DND on their phones and still hear calls to their private lines.
SIP: Do Not Disturb
In Cisco Unified CME 7.1 and later versions, the Do Not Disturb (DND) feature for SIP phones prevents incoming calls from audibly ringing a phone. When DND is enabled, the phone flashes an alert to visually indicate an incoming call instead of ringing and the call can be answered if desired. The message “Do Not Disturb is active” displays on the phone and calls are logged to the Missed Calls directory.
In versions earlier than Cisco Unified CME 7.1, the DND feature blocks incoming calls to a SIP phone with a busy tone. Cisco Unified CME rejects calls to all lines on the phone and plays a busy tone to the caller. Received calls are not logged to the Missed Calls directory on the phone.
DND applies to all lines on the phone. If DND and Call Forward All are both enabled on a phone, Call Forward All takes precedence on incoming calls.
You must enable DND for a SIP phone through Cisco Unified CME. The DND soft key displays by default on supported SIP phones in both the Ringing and Idle states. You can remove or change the order of this soft key using a voice register template.
A phone user can toggle DND on and off at the phone by using the DND soft key. If a SIP phone user activates DND during an incoming call, the DND state remains active during the current call and for all future calls until the user explicitly toggles DND off.
If a phone user toggles DND on or off at the phone, Cisco Unified CME restores the DND state after the phone resets or restarts, if you save the running configuration before Cisco Unified CME reboots.
To block DND on phones that have buttons configured for feature ringing, perform the following steps. DND is enabled by using the DND soft key on Cisco Unified IP phones that support soft keys.
Cisco Unified 3.2.1 or a later version.
Phone line must be configured for feature ring with the button f command.
Call-forwarding no-answer must be set for a phone to use DND to forward calls. For configuration information, see Configuring Call Transfer and Forwarding. No other configuration is necessary for basic DND.
Phone users cannot enable DND for a shared line in a hunt group. The soft key displays in the idle and ringing states but does not enable DND for shared lines in hunt groups.
1. e nable
2. configure terminal
3. ephone phone-tag
4. no dnd feature-ring
Command or Action
Enables privileged EXEC mode.
Enter your password if prompted.
Router# configure terminal
Enters global configuration mode.
Router(config)# ephone 10
Enters ephone configuration mode.
phone-tag —Unique sequence number that identifies the ephone to be configured.
no dnd feature-ring
Router(config-ephone)# no dnd feature-ring
Enables ringing on phone buttons configured for feature ring when the phone is in DND mode.
Returns to privileged EXEC mode.
In the following configuration example, when DND is activated on ephone 1 and ephone 2, button 1 will ring, but button 2 will not.
no dnd feature-ring
no dnd feature-ring
SCCP: Verifying Do Not Disturb
show ephone dnd
Use this command to display a list of SCCP phones that have DND enabled.
To enable the Do Not Disturb (DND) feature on a SIP phone, perform the following steps.
Cisco CME 3.4 or a later version.
Cisco Unified CME 7.1 or a later version to use the DND soft key.
Call-forwarding busy must be set for a SIP IP phone to use DND to forward calls. For configuration information, see “Configuring Call Transfer and Forwarding” in the Cisco Unified CME System Administrator Guide .
In versions earlier than Cisco Unified CME 7.1, you enable the DND soft key on SIP phones by using the dnd-control command.
If you enable DND on the phone and remove the DND soft key, the user cannot toggle DND off at the phone.
Cisco Unified IP Phone 7911G, 7941G, 7941GE, 7961G, 7961GE, 7970G, and 7971GE
For SIP phones using firmware 8.3 or a later version, the DND feature prevents calls from ringing; it does not block calls or play a busy tone to the caller.
If DND is disabled by a phone user, it is not enabled after the phone resets or restarts. DND must be enabled both in Cisco Unified CME and by using the DND soft key on the phone.
Modifies the order and type of soft keys that display on a SIP phone during the ringing call state.
Exits ephone-template configuration mode.
voice register pool phone-tag
Router(config)# voice register pool 1
Enters voice register pool configuration mode to set parameters for the SIP phone.
Enables DND on the phone.
If Call Forward No Answer is not configured for the extension, pressing the DND soft key mutes the ringer for incoming calls.
Router(config-register-pool)# template 5
Applies the ephone template to the phone.
template-tag —Unique identifier of the template that you created in Step 3
Returns to privileged EXEC mode.
The following example shows DND is enabled on phone 130, and the DND soft key is modified in template 6, which is assigned to the phone:
voice register template 6
softkeys idle Gpickup Pickup DND Redial
softkeys ringIn DND Answer
voice register pool 130
id mac 001A.A11B.500E
number 1 dn 30
Where to Go Next
Agent Status Control for Ephone Hunt Groups and Cisco Unified CME B-ACD
Ephone hunt group agents can control their ready/not-ready status (their ability to receive calls) using the DND function or the HLog function of their phones. When they use the DND soft key, they do not receive calls on any extension on their phones. When they use the HLog soft key, they do not receive calls on hunt group extensions, but they do receive calls on other extensions. For more information on agent status control and the HLog function, see Configuring Call Coverage Features.
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NoteTable 22-2 lists the Cisco Unified CME version that introduced support for a given feature. Unless noted otherwise, subsequent versions of Cisco Unified CME software also support that feature.
Table 22-2 Feature Information for Do Not Disturb
Cisco Unified CME
Do Not Disturb
Enhanced DND support on SIP phones to allow incoming calls to visually flash an alert.
Added support for Do-not-disturb (DND) soft key on SIP phones.
DND bypass for feature-ring phones was introduced.