Zoom Phone Local Survivability | Zoom Technical Library

Publisher

Zoom Communications

URL

https://library.zoom.com/advanced-enterprise-services/zoom-node/zoom-node-explainer/zoom-phone-local-survivability

Published

unknown

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

Zoom website terms of use; no-redistribution; short excerpts and locators only

Source notes citing this source

• Active calls are not preserved when survivability mode engages; users hear a fast busy tone and must re-establish the call. in context
• After exiting survivability mode, the ZPLS module uploads call detail records for the calls made during the event, marked as survivability-mode calls. in context
• Cloud service and routing are restored once the ZPLS module has kept reliable SIP zone connectivity for about five minutes, and devices re-register with no admin or user action. in context
• Failover into survivability mode takes about three minutes, varying with the number of devices. in context
• Survivability mode engages only when both the ZPLS module and the client devices cannot reach the site-specific SIP zones. in context
• Voicemail, call pickup, auto receptionists, call queues, conferences of 4 or more parties, end-to-end encryption and call monitoring are unavailable in survivability mode. in context
• Nomadic e911 calling is not available in survivability mode. in context
• Site changes, including added or modified users and devices, are synchronised to the ZPLS module once every 10 hours. in context
• ZPLS is the third-priority registrar for supported devices, after the primary and secondary cloud SIP zones; during normal operation it does not handle calls and sends OPTIONS pings to the site's SIP zones. in context

Cite this source record

APA

WarmTransfer. (2026, September 25). Zoom Phone Local Survivability | Zoom Technical Library. WarmTransfer. https://warmtransfer.net/knowledge/sources/zoom-library-zpls-node-explainer

BibTeX

@misc{warmtransfer-zoom-library-zpls-node-explainer,
  title  = {Zoom Phone Local Survivability | Zoom Technical Library},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/zoom-library-zpls-node-explainer},
  note   = {Zoom Communications, accessed 2026-09-25}
}