Audio specifications for Webex Calling

Publisher

Cisco Webex

URL

https://help.webex.com/en-us/article/gm3pa0/Audio-specifications-for-Webex-Calling

Published

2025-04-10

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

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

Source notes citing this source

• Cisco's Webex Calling audio specification says each codec uses 70-80 kbps per audio stream. in context
• Webex Calling's 70-80 kbps per-stream figure probably reflects G.711 at 20 ms counted at the IP layer without Layer 2 overhead, which is 80 kbps by Cisco's header sizes. Planning at 100 kbps then leaves headroom for Layer 2, SRTP and tunnel overhead. inferred in context
• On Webex Calling, analog telephone adapters (ATAs) and DECT phones do not support Opus. in context
• Webex Calling requires every INVITE to include G.711 so calls stay compatible across call flows. in context
• Webex Calling does not support calls that offer only G.729. in context
• Webex Calling uses Opus as its optimised codec for most client call flows, and G.711 is its universal codec. in context
• For Webex Calling, Cisco recommends allowing 100 kbps per audio stream, and 200 kbps for an internal enterprise call, which needs two audio streams. in context
• Webex Calling uses G.711 for PSTN calls, because most PSTN providers do not support Opus. in context

Cite this source record

APA

WarmTransfer. (2025, April 10). Audio specifications for Webex Calling. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-help-gm3pa0-wxc-audio-specs

BibTeX

@misc{warmtransfer-cisco-help-gm3pa0-wxc-audio-specs,
  title  = {Audio specifications for Webex Calling},
  author = {{WarmTransfer}},
  year   = {2025},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-help-gm3pa0-wxc-audio-specs},
  note   = {Cisco Webex, accessed 2026-09-24}
}