Webex Calling media optimization with Interactive Connectivity Establishment (ICE)

Publisher

Cisco Systems, Inc. (help.webex.com)

URL

https://help.webex.com/en-us/article/nt6eyxb/Webex-Calling-Media-Optimization-with-Interactive-Connectivity-Establishment(ICE)

Published

2026-08-17

Updated

unknown

Accessed

2026-09-16

HTTP status

200

License

Cisco proprietary documentation, all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• Data about calls using media optimization is shown in Control Hub's Media Quality analytics and in the Troubleshooting tool. in context
• The Local Gateway (CUBE) supports ICE-lite for Webex Calling media optimization, with restrictions. It requires CUBE software 17.3 or 16.12.5 or later and is enabled with the STUN usage ICE-lite configuration. in context
• Media optimization with a Local Gateway needs network reachability between the device and the Local Gateway, either through a public IP address or because the Local Gateway host address is reachable on the same network. in context
• Data for optimized calls is available through the Media Quality analytics page in Control Hub or through the Control Hub troubleshooting tool. in context
• The Webex Calling media optimization article names no edition restriction and does not mention Webex for Government, so the corpus holds no source for the claim that media optimization is unavailable in that edition. field report in context
• Webex Calling media optimization runs in 4 phases: candidate discovery in which an endpoint collects its local address and a server reflexive address obtained by querying a STUN server in the Webex Calling cloud, candidate exchange in which endpoints exchange those addresses using SIP, connectivity checks in which the endpoints test the exchanged candidates, and media path optimization in which a re-INVITE moves the media onto the chosen path. in context
• Media optimization with a Local Gateway requires network reachability between the device and the Local Gateway, achieved either by assigning a public IP address to the Local Gateway or by ensuring the Local Gateway host address is accessible to a device on the same network as the gateway. in context
• Media optimization on a Local Gateway is enabled with the command STUN usage lite, the Local Gateway running Cisco Unified Border Element supports ICE-lite with several restrictions, and the feature requires a minimum CUBE software version of 17.3 or 16.12.5. in context
• Where call recording is enabled the media for recorded calls is routed to the cloud and is not optimized, and Cisco states that media optimization and call recording each independently introduce a small audio delay at the beginning of a call and that together the delay is slightly longer and more noticeable to customers. in context
• Webex Calling media optimization is supported across desk phones excluding DECT and analog telephone adapter devices, the Webex App, and the Local Gateway solution, and is enabled by default on desk phones and the Webex App without configuration. in context
• Signalling data is always sent to the Webex Calling cloud to route calls and an active internet connection is always required to make Webex Calling calls; media optimization changes only the media path, which Cisco notes makes up most of a call's traffic. in context
• Cisco states that calls can only be optimized within a single organisation and that for interorganization calls media must flow through the PSTN for regulatory reasons. in context

Cite this source record

APA

WarmTransfer. (2026, August 17). Webex Calling media optimization with Interactive Connectivity Establishment (ICE). WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-help-nt6eyxb-media-optimization-ice

BibTeX

@misc{warmtransfer-cisco-help-nt6eyxb-media-optimization-ice,
  title  = {Webex Calling media optimization with Interactive Connectivity Establishment (ICE)},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-help-nt6eyxb-media-optimization-ice},
  note   = {Cisco Systems, Inc. (help.webex.com), accessed 2026-09-16}
}