Modify Bandwidth Consumption Calculation for Voice Calls

Publisher

Cisco

URL

https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/7934-bwidth-consume.html

Published

2023-12-11

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 computes total packet size as Layer 2 header plus IP/UDP/RTP header plus voice payload, and packets per second as codec bit rate divided by voice payload size. Per-call bandwidth is total packet size times PPS. in context
• Cisco lists G.711 (64 kbps) at 20 ms packetization (160-byte payload, 50 packets per second) as 87.2 kbps per call direction on Ethernet. in context
• Cisco lists G.722 at 64 kbps (G.722_64k) with the same 20 ms packetization, 50 packets per second and 87.2 kbps Ethernet bandwidth as G.711. in context
• Cisco lists G.729 (8 kbps) at 20 ms packetization (20-byte payload, 50 packets per second) as 31.2 kbps per call direction on Ethernet. in context
• Cisco's voice bandwidth calculation uses 40 bytes of IP/UDP/RTP header (20 IP + 8 UDP + 12 RTP), 18 bytes of Ethernet Layer 2 header including FCS, and 2 or 4 bytes when compressed RTP (cRTP) is used. in context
• Cisco says voice activity detection (VAD) can save up to 35 percent of bandwidth, averaged over time across more than 24 calls. in context

Cite this source record

APA

WarmTransfer. (2023, December 11). Modify Bandwidth Consumption Calculation for Voice Calls. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-techdoc-7934-voice-bandwidth

BibTeX

@misc{warmtransfer-cisco-techdoc-7934-voice-bandwidth,
  title  = {Modify Bandwidth Consumption Calculation for Voice Calls},
  author = {{WarmTransfer}},
  year   = {2023},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-techdoc-7934-voice-bandwidth},
  note   = {Cisco, accessed 2026-09-24}
}