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Zoom Support Maintenance: 9/18/2021

Date and time: 9/18/2021 at 1PM PST for 10 hrs 30 min

We will be performing routine maintenance for Zoom Support. During this time, users may experience system delays or longer than expected wait times when contacting Zoom Support via phone, chat or web submission. All other request methods, based on your plan, will be available during this time. Please refer to for available contact options.

Affected components: Zoom Support Center

Supported desk phone features Follow


The following table provides the list of features available on certified desk phones.

Note: This article does not apply to certified gateways and analog telephone adapters.

This article covers:


  • Provisioned desk phone assigned to a phone user

Note: If you have provisioned desk phone set up as a common area phone, some desk phone features will be limited.


Click the embedded links to learn more about each feature.

Feature Poly Yealink Cisco AudioCodes

In-call controls

Call flip (see note) Partial Partial  
Call monitoring (listen, whisper, barge, take over) - see note Partial Partial    
Call park (see note) Partial Partial    
Companion mode - see note Partial Partial    
Elevate to Zoom meeting        
Hold/resume calls
Sync in-call status with Zoom desktop client and mobile app  
Transfer calls
Transfer to voicemail (see note) Partial Partial    Partial
View and manage voicemail

Additional features

Company directory search (search phone users in the account) - see note Partial  
DND (do not disturb) status (see note) Partial Partial Partial  
Group call pickup (see note)   Partial    
Hot desking   Partial
Multiple line keys assigned to direct phone numbers (see note) Partial
Set up call forwarding    
Screen lock (see note) Partial Partial    
Shared directory of external contacts        
Shared lines (Call delegation and shared line groups) - see note Partial Partial    
Speed dial and busy lamp field (see note) Partial Partial   Partial
Send and receive fax (see setup guide for limitations) Partial      


Assisted provisioning
Auto firmware upgrade  
Custom admin password and language (see note) Partial
Custom firmware required      
Custom time format and zone
Multiple phone users per device (see note) Partial Partial    Partial
Provision templates (see note)   Partial
Sync time with NTP server
Zero touch provisioning (see note) Partial  


Notes for features with partial support

Admin password

The Admin Password setting located in the account-level desk phone settings doesn't apply to AudioCodes 445HD, 450HD, and C450HD.

Do not disturb (DND) status

The DND status only applies to the phone you set it on. This status does not sync on other desk phones assigned to you or the Zoom desktop client or mobile app.

The DND status functions differently depending on the manufacturer:

  • Poly: Sound notifications are blocked, but you will still see a visual notification on the phone's screen.
  • Yealink: All on-screen and sound notifications are blocked.

Call delegation and shared line groups

The following phone models support call delegation and shared line groups. Models not on this list might support some features like making and receiving calls using a shared line, but won’t show the status of shared lines.

  • Poly: CCX 400/500/600/700, VVX 150/250/350/450
  • Yealink: All certified models except CP920, W56P, W60P, W80, W90

Companion mode

Companion mode is supported on these models:

  • Poly: VVX 250/350/450
  • Yealink: All certified models except CP920, W56P, W60P, W80, W90

Company directory search

Company directory search is supported on these models:


  • The Zoom Phone admin must re-sync desk phones for the contacts directory to appear. Alternatively, phone users can re-sync their desk phone by manually rebooting it.
  • Refer to the quick start guides for Poly or Yealink if you need help using the company directory.
  • If company directory search isn't working, make sure to open outbound port 390.

Call flip

Call flip is supported on these models:

  • Poly: All certified models except OBi302, OBi508, SoundPoint 335, SoundPoint 550, SoundPoint 650, SoundStation 5000, SoundStation 6000, Trio 8500, Trio 8800
  • Yealink: All certified models except CP920, CP960, W56P, W60P, W80, W90

All other certified Poly and Yealink models support call flip.

Call park

Call park is supported on these models:

Call monitoring (listen, whisper, barge, take over)

Call monitoring is supported on these models:

Group call pickup

Group call pickup is supported on these models:

  • Yealink: CP920, CP960, T27G, T31G, T31P, T33G, T42S, T43U, T46S, T46U, T48S, T53, T53W, T54W, T56A, T57W, T58A, VP59

Hot desking

The following AudioCodes models support hot desking: 445HD, 450HD.

Multiple line keys

Multiple line keys are supported on these models:

  • AudioCodes: 445HD, 450HD, C450HD

Multiple phone users per device

You can assign multiple phone users to these models. This feature is also known as
multi-SIP extension registry.

Provision templates

Provision templates are supported on these models.

Screen lock

The following models support screen lock:

Note: Screen lock is only supported on desk phones assigned to one phone user. Screen lock is not supported on common area phones and phones with multiple phone users.

Speed dial and busy lamp field

The following models support speed dial and busy lamp field:

  • AudioCodes: 445HD, 450HD
  • Poly: CCX 400/500/600/700, VVX 150/250/350/450
  • Yealink: All certified models except CP920, W56P, W60P, W80, W90

Transfer to voicemail

Transfer to voicemail is supported on these models:

  • AudioCodes445HD, 450HD, C450HD
  • Poly: All non-EOL models
  • Yealink: All certified models

Zero touch provisioning (ZTP)

See the list of certified Zoom Phone devices for models that support ZTP.