# Wi-Fi design for voice

Canonical: https://warmtransfer.net/knowledge/wifi-voice-design

Last verified: 2026-09-25

Wi-Fi design for voice requires specific signal thresholds, proper quality-of-service mappings, and controlled radio parameters to ensure real-time media operates reliably across access points[^6][^39]. Documented vendor and standards recommendations define radio frequency levels, roaming mechanisms, admission control, and packet prioritization for wireless voice environments[^51][^40].

## RF design parameters

Cisco's VoWLAN troubleshooting guide gives -67 dBm as the optimal VoWLAN cell-edge signal[^51]. Cisco's 8821 troubleshooting guidance says the next access point should have an RSSI of -67 dBm or greater for the phone to roam successfully[^6]. Cisco TechNote 214215 states that every spot in the coverage area should be served by at least 2 viable 5 GHz access points at -67 dBm or stronger[^13]. Cisco's VoWLAN guide also specifies that the noise floor should not exceed -92 dBm so that a -67 dBm cell edge yields a 25 dB SNR[^56]. Similarly, Cisco's 8821 troubleshooting guidance states that SNR should be 25 dB or higher for acceptable voice quality[^12].

Juniper Mist recommends a signal of at least -65 dBm for both client and AP and an SNR of at least 25 for voice and video[^35]. Microsoft states that Teams Rooms devices and at least 1 access point should see each other at -60 dBm or better[^46]. WarmTransfer's reading of the sources is that published Wi-Fi voice signal targets differ by vendor and device class (Cisco -67 dBm for handsets, Juniper Mist -65 dBm, Microsoft -60 dBm for Teams Rooms), so a design should meet the strictest target among the devices it must support[^42]. However, Microsoft strongly recommends wired rather than wireless connections for Teams Rooms devices[^49].

For cell overlap, Cisco's VoWLAN guide calls for at least 20 percent cell overlap at 2.4 GHz and 15 to 20 percent at 5 GHz between access points on different channels[^52]. Microsoft says neighbouring access points should be on non-overlapping channels to avoid co-channel competition[^45]. Cisco TechNote 214215 specifies that a moving phone must hear each roamed-to AP at least 5 seconds before it needs to roam to it[^10].

Regarding channel metrics, Cisco's VoWLAN guide states that overall channel utilization should be less than 50 percent[^53]. Microsoft's Teams Rooms guidance says to keep wireless channel utilization below 50 percent[^48]. Cisco's VoWLAN guide further notes that retransmissions should be kept under 20 percent, packet loss should stay under 1 percent, and jitter must remain under 100 ms[^57][^54].

To determine coverage and AP placement, the Cisco 8821 administration guide requires a site survey to determine AP placement, power levels, and channel assignments, and a post-installation survey after network changes[^11]. Cisco's VoWLAN guide specifies that WCS predictive heat maps must not be used as a pre- or post-deployment site survey tool, and recommends physical walk-through measurement with survey and spectrum tools[^55].

## Radio configuration and channel utilization

Microsoft says 5 GHz is better suited to real-time media than 2.4 GHz but needs more access points for coverage, and endpoints must support and be configured for it[^43]. Juniper Mist also recommends 5 GHz for voice and video and disabling 6 and 9 Mbps rates on 802.11a if possible[^31]. Cisco TechNote 214215 recommends using at least 8 channels in 5 GHz where available and avoiding DFS channels that see frequent radar detection[^4]. For transmit power, Cisco TechNote 214215 recommends 5 GHz AP transmit power of at least 11 dBm, typically 14 to 17 dBm outside dense deployments[^5].

For data rates on Cisco infrastructure, Cisco TechNote 214215 recommends 12 Mbps as the lowest rate, and 6 Mbps as lowest mandatory with 12 and 24 Mbps enabled where coverage is marginal[^1]. For 8821 voice on a Catalyst 9800 WLC, Cisco TechNote 214863 sets 12 Mbps mandatory, 18 Mbps and above supported, and all rates below 12 Mbps disabled on both 2.4 GHz and 5 GHz[^18].

Sources disagree on the configuration of band select and band steering across voice WLANs[^16][^15][^33][^44][^47]. Cisco TechNote 214863 disables band select and load balancing on the 8821 voice WLAN, though this is disputed[^16]. This is disputed by configurations permitting it, but the Catalyst 9800 IOS XE 17.3 configuration guide states that band-select-enabled WLANs do not support time-sensitive applications such as voice and video because of roaming delays[^15]. Sources disagree with enabling it as Juniper Mist's voice and video troubleshooting guidance says to disable band steering and let clients choose a band[^33]. Conversely, this is disputed by Microsoft's Teams network guidance, which says to consider band steering on dual-band Wi-Fi to push clients to 5 GHz[^44]. Sources disagree with disabling it as Microsoft's Teams Rooms guidance says to enable band steering so 5 GHz gets priority when it shares an SSID with 2.4 GHz[^47].

On the Catalyst 9800, Cisco TechNote 214863 enables off-channel scan defer for priorities 5, 6, and 7 so the AP does not go off-channel shortly after voice frames[^22].

## Roaming and fast transition

Juniper Mist explains that 802.11r cuts the roaming key exchange from 8 messages to 4 by carrying key exchange in the authentication and association frames[^30]. Juniper Mist also states that the client, not the AP, decides when to roam; 802.11k neighbor reports and 802.11v suggestions only inform that decision[^32]. Juniper Mist notes that some clients, including Apple iOS phones, do not support Opportunistic Key Caching[^34].

For Cisco handsets, Cisco TechNote 214215 recommends WPA2/AES Enterprise with 802.11r FT over the air for the 8821, and WPA2/AES Enterprise with CCKM for the 792x[^3]. As of its April 2021 update, Cisco TechNote 214215 states that the 8821 and 792x do not support 802.11k and 802.11v and that those features should be disabled[^7]. For 802.1X WLANs carrying 8821 voice on a Catalyst 9800, Cisco TechNote 214863 recommends FT+802.1X as the AKM with Fast Transition enabled and Over the DS disabled[^19]. Cisco TechNote 214863 says Fast Transition is not required on PSK voice WLANs because the PSK roaming handshake is already short[^23].

Wi-Fi Alliance describes Wi-Fi CERTIFIED Voice-Enterprise as building on WMM, WMM-Admission Control and WMM-Power Save to keep voice quality consistent while roaming across multiple APs[^58].

## Call admission control and capacity

Under WMM-Admission Control a client sends a TSPEC request, the AP grants medium time only if network load and channel conditions allow, and a rejected client may not start that traffic stream[^59]. In Cisco's CAC guide, TSPEC is how a WLAN client requests admission from an AP, using ADDTS action frames at call setup or on re-association[^28]. Cisco describes static CAC as charging a fixed medium time per call against a percentage of the total, while load-based CAC also accounts for channel load, co-channel interference and SNR, which yields more calls[^27].

Cisco's VoWLAN CAC guide states a G.711 stream uses 538 medium times (1,076 per bidirectional call) out of 31,250 medium times available per AP[^26]. Cisco's 2015 VoWLAN CAC guide expects 14 simultaneous calls per 2.4 GHz channel and 20 per 5 GHz channel, assuming no competing high-priority traffic and normal background noise[^25]. WarmTransfer's reading of the sources is that Cisco's 14 and 20 calls-per-channel figures come from a 2015 guide tied to legacy data rates and G.711 and should not be read as current per-AP capacity for Wi-Fi 6 or later[^29].

On the Catalyst 9800 (IOS XE 17.3), the default voice CAC values are Voice Max RF Bandwidth 75 percent and Voice Reserved Roaming Bandwidth 6 percent, with voice admission control (ACM) disabled by default[^17]. Cisco TechNote 214863 enables load-based call admission control on both 2.4 GHz and 5 GHz radios for 8821 voice on the Catalyst 9800[^20]. Cisco TechNote 214863 notes that SIP CAC is not supported on the Catalyst 9800 after IOS XE 17.3.1[^21]. The 8821 administration guide recommends disabling SIP CAC on the WLAN[^2].

## Quality of service mapping

Microsoft's Teams network guidance says to implement QoS or WMM so media is prioritized over Wi-Fi[^50]. Cisco TechNote 214863 applies auto-QoS voice, the platinum and platinum-up service policies, and the optimized-voice EDCA profile on both bands[^24].

RFC 8325 says the default practice of copying the top 3 DSCP bits into the 802.11 UP produces inconsistent mappings, including putting voice in AC_VI rather than AC_VO[^40]. RFC 8325 standardizes Diffserv to IEEE 802.11 mappings as follows:
- Maps EF (DSCP 46) to 802.11 UP 6, placing voice in the Voice Access Category (AC_VO)[^39].
- Recommends mapping VOICE-ADMIT (DSCP 44) to UP 6 as well[^41].
- Recommends mapping signaling traffic marked CS5 to UP 5 in the Video Access Category (AC_VI)[^37].
- Summary table maps CS3 (the Broadcast Video class) to UP 4 in AC_VI[^36].
- Packets from wireless clients requesting CS6 or CS7 should be mapped to UP 0 rather than UP 7, and the client OS should re-mark them to DSCP 0[^38].

For Cisco handsets, the 8821 administration guide lists voice as DSCP 46 (EF), 802.1p 5 and WMM UP 6[^9]. It lists SIP call control as DSCP 24 (CS3), 802.1p 3 and WMM UP 4[^8].

## See also

- [QoS marking and queuing for voice](https://warmtransfer.net/knowledge/qos-marking)
- [Choppy and robotic audio on calls](https://warmtransfer.net/knowledge/choppy-audio-troubleshooting)
- [Teams phones and certified devices](https://warmtransfer.net/knowledge/teams-phone-devices)
- [Voice for remote and home workers](https://warmtransfer.net/knowledge/remote-worker-voice)

## Applicability

Cisco TechNote 214215 channel recommendations are given with a US channel list[^4]. SIP CAC is not supported on the Catalyst 9800 after IOS XE 17.3.1[^21]. Catalyst 9800 default CAC parameters are documented for IOS XE 17.3[^17]. The Catalyst 9800 band select restrictions are documented for IOS XE 17.3, though this is disputed[^15]. TechNote 214215 states that the 8821 and 792x do not support 802.11k and 802.11v as of its April 2021 update[^7].

## What remains uncertain

Sources disagree on whether band select and band steering should be enabled or disabled on WLANs carrying voice[^16][^15][^33][^44][^47]. Whether Cisco 8821 or 792x firmware released after April 2021 added 802.11k or 802.11v support is not covered by the sources below. Per-AP voice call capacity for Wi-Fi 6 and later standards under modern codecs is not covered by the sources below.

## Sources

[^1]: Cisco TechNote 214215 recommends 12 Mbps as the lowest rate, and 6 Mbps as lowest mandatory with 12 and 24 Mbps enabled where coverage is marginal. Source: [How to get your 8821/792x wireless phones performing reliably](https://www.cisco.com/c/en/us/support/docs/collaboration-endpoints/wireless-ip-phone-8821/214215-how-to-get-your-8821-792x-wireless-phone.html), Section 5, Optimize channels, power, and data rates. Checked 2026-09-25.
[^2]: The 8821 administration guide recommends disabling SIP CAC on the WLAN. Source: [Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager - VoIP Networks](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/8821/english/adminguide/w88x_b_wireless-8821-8821ex-admin-guide/w88x_b_wireless-8821-8821ex-admin-guide_chapter_01.html), VoIP Networks > call admission control paragraph. Checked 2026-09-25.
[^3]: Cisco TechNote 214215 recommends WPA2/AES Enterprise with 802.11r FT over the air for the 8821, and WPA2/AES Enterprise with CCKM for the 792x. Source: [How to get your 8821/792x wireless phones performing reliably](https://www.cisco.com/c/en/us/support/docs/collaboration-endpoints/wireless-ip-phone-8821/214215-how-to-get-your-8821-792x-wireless-phone.html), Section 4, Optimize Security for Fast Secure Roaming. Checked 2026-09-25.
[^4]: Cisco TechNote 214215 recommends using at least 8 channels in 5 GHz where available and avoiding DFS channels that see frequent radar detection. Source: [How to get your 8821/792x wireless phones performing reliably](https://www.cisco.com/c/en/us/support/docs/collaboration-endpoints/wireless-ip-phone-8821/214215-how-to-get-your-8821-792x-wireless-phone.html), Section 5, Optimize channels, power, and data rates. Checked 2026-09-25.
[^5]: Cisco TechNote 214215 recommends 5 GHz AP transmit power of at least 11 dBm, typically 14 to 17 dBm outside dense deployments. Source: [How to get your 8821/792x wireless phones performing reliably](https://www.cisco.com/c/en/us/support/docs/collaboration-endpoints/wireless-ip-phone-8821/214215-how-to-get-your-8821-792x-wireless-phone.html), Section 5, Optimize channels, power, and data rates. Checked 2026-09-25.
[^6]: Cisco's 8821 troubleshooting guidance says the next access point should have an RSSI of -67 dBm or greater for the phone to roam successfully. Source: [Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager - Troubleshooting](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/8821/english/adminguide/w88x_b_wireless-8821-8821ex-admin-guide/w88x_b_wireless-8821-8821ex-admin-guide_chapter_01001.html), Troubleshooting > Roaming and Voice Quality or Lost Connection Problems. Checked 2026-09-25.
[^7]: As of its April 2021 update, Cisco TechNote 214215 states that the 8821 and 792x do not support 802.11k and 802.11v and that those features should be disabled. Source: [How to get your 8821/792x wireless phones performing reliably](https://www.cisco.com/c/en/us/support/docs/collaboration-endpoints/wireless-ip-phone-8821/214215-how-to-get-your-8821-792x-wireless-phone.html), Section 4, Optimize Security for Fast Secure Roaming, note. Checked 2026-09-25.
[^8]: The 8821 administration guide lists SIP call control as DSCP 24 (CS3), 802.1p 3 and WMM UP 4. Source: [Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager - VoIP Networks](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/8821/english/adminguide/w88x_b_wireless-8821-8821ex-admin-guide/w88x_b_wireless-8821-8821ex-admin-guide_chapter_01.html), VoIP Networks > QoS (voice / call control / video mapping table). Checked 2026-09-25.
[^9]: The 8821 administration guide lists voice as DSCP 46 (EF), 802.1p 5 and WMM UP 6. Source: [Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager - VoIP Networks](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/8821/english/adminguide/w88x_b_wireless-8821-8821ex-admin-guide/w88x_b_wireless-8821-8821ex-admin-guide_chapter_01.html), VoIP Networks > QoS (voice / call control / video mapping table). Checked 2026-09-25.
[^10]: Cisco TechNote 214215 says a moving phone must hear each roamed-to AP at least 5 seconds before it needs to roam to it. Source: [How to get your 8821/792x wireless phones performing reliably](https://www.cisco.com/c/en/us/support/docs/collaboration-endpoints/wireless-ip-phone-8821/214215-how-to-get-your-8821-792x-wireless-phone.html), Section 1, Have solid coverage in 5GHz. Checked 2026-09-25.
[^11]: The 8821 administration guide requires a site survey to determine AP placement, power levels and channel assignments, and a post-installation survey after network changes. Source: [Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager - VoIP Networks](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/8821/english/adminguide/w88x_b_wireless-8821-8821ex-admin-guide/w88x_b_wireless-8821-8821ex-admin-guide_chapter_01.html), VoIP Networks > site survey guidance. Checked 2026-09-25.
[^12]: Cisco's 8821 troubleshooting guidance says SNR should be 25 dB or higher for acceptable voice quality. Source: [Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager - Troubleshooting](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/8821/english/adminguide/w88x_b_wireless-8821-8821ex-admin-guide/w88x_b_wireless-8821-8821ex-admin-guide_chapter_01001.html), Troubleshooting > Roaming and Voice Quality or Lost Connection Problems. Checked 2026-09-25.
[^13]: Cisco TechNote 214215 says every spot in the coverage area should be served by at least two viable 5 GHz access points at -67 dBm or stronger. Source: [How to get your 8821/792x wireless phones performing reliably](https://www.cisco.com/c/en/us/support/docs/collaboration-endpoints/wireless-ip-phone-8821/214215-how-to-get-your-8821-792x-wireless-phone.html), Section 1, Have solid coverage in 5GHz. Checked 2026-09-25.
[^14]: Cisco's Catalyst 9800 best-practices guide recommends 802.11r mixed mode instead of adaptive 802.11r. Source: [Cisco Catalyst 9800 Series Configuration Best Practices](https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/technical-reference/c9800-best-practices.html), Wireless security / fast roaming best practices (heading not captured). Checked 2026-09-25.
[^15]: The Catalyst 9800 IOS XE 17.3 configuration guide states that band-select-enabled WLANs do not support time-sensitive applications such as voice and video because of roaming delays (disputed). Source: [Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide, Cisco IOS XE 17.3.x - 802.11 parameters and Band Selection](https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/17-3/config-guide/b_wl_17_3_cg/m_config_band_select_ewlc.html), Band Selection > Restrictions. Checked 2026-09-25.
[^16]: Cisco TechNote 214863 disables band select and load balancing on the 8821 voice WLAN (disputed). Source: [Configure a WLAN for Voice with the 8821 on Catalyst 9800 WLC](https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/214863-voice-deployment-on-catalyst-9800-wirele.html), Configure > Advanced WLAN settings. Checked 2026-09-25.
[^17]: On the Catalyst 9800 (IOS XE 17.3), the default voice CAC values are Voice Max RF Bandwidth 75 percent and Voice Reserved Roaming Bandwidth 6 percent, with voice admission control (ACM) disabled by default. Source: [Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide, Cisco IOS XE 17.3.x - 802.11 parameters and Band Selection](https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/17-3/config-guide/b_wl_17_3_cg/m_config_band_select_ewlc.html), 802.11 parameters > Call Admission Control, sample show output. Checked 2026-09-25.
[^18]: Cisco TechNote 214863 sets 12 Mbps mandatory, 18 Mbps and above supported, and all rates below 12 Mbps disabled on both 2.4 GHz and 5 GHz for 8821 voice. Source: [Configure a WLAN for Voice with the 8821 on Catalyst 9800 WLC](https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/214863-voice-deployment-on-catalyst-9800-wirele.html), Configure > Data rates (2.4 GHz and 5 GHz). Checked 2026-09-25.
[^19]: For 802.1X WLANs carrying 8821 voice on a Catalyst 9800, Cisco TechNote 214863 recommends FT+802.1X as the AKM with Fast Transition enabled and Over the DS disabled. Source: [Configure a WLAN for Voice with the 8821 on Catalyst 9800 WLC](https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/214863-voice-deployment-on-catalyst-9800-wirele.html), Configure > WLAN security settings. Checked 2026-09-25.
[^20]: Cisco TechNote 214863 enables load-based call admission control on both 2.4 GHz and 5 GHz radios for 8821 voice on the Catalyst 9800. Source: [Configure a WLAN for Voice with the 8821 on Catalyst 9800 WLC](https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/214863-voice-deployment-on-catalyst-9800-wirele.html), Configure > QoS and call admission control. Checked 2026-09-25.
[^21]: Cisco TechNote 214863 notes that SIP CAC is not supported on the Catalyst 9800 after IOS XE 17.3.1. Source: [Configure a WLAN for Voice with the 8821 on Catalyst 9800 WLC](https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/214863-voice-deployment-on-catalyst-9800-wirele.html), Configure > QoS and call admission control, note. Checked 2026-09-25.
[^22]: Cisco TechNote 214863 enables off-channel scan defer for priorities 5, 6 and 7 so the AP does not go off-channel shortly after voice frames. Source: [Configure a WLAN for Voice with the 8821 on Catalyst 9800 WLC](https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/214863-voice-deployment-on-catalyst-9800-wirele.html), Configure > Advanced WLAN settings. Checked 2026-09-25.
[^23]: Cisco TechNote 214863 says Fast Transition is not required on PSK voice WLANs because the PSK roaming handshake is already short. Source: [Configure a WLAN for Voice with the 8821 on Catalyst 9800 WLC](https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/214863-voice-deployment-on-catalyst-9800-wirele.html), Configure > WLAN security settings. Checked 2026-09-25.
[^24]: Cisco TechNote 214863 applies auto-QoS voice, the platinum and platinum-up service policies, and the optimized-voice EDCA profile on both bands. Source: [Configure a WLAN for Voice with the 8821 on Catalyst 9800 WLC](https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/214863-voice-deployment-on-catalyst-9800-wirele.html), Configure > QoS and EDCA parameters. Checked 2026-09-25.
[^25]: Cisco's 2015 VoWLAN CAC guide expects 14 simultaneous calls per 2.4 GHz channel and 20 per 5 GHz channel, assuming no competing high-priority traffic and normal background noise. Source: [Voice Over Wireless LAN (VoWLAN) Troubleshooting Guide - Troubleshooting Call Admissions Control](https://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/5_Troubleshooting_CAC_Rev1-2.html), Chapter 5, Troubleshooting Call Admissions Control, call capacity. Checked 2026-09-25.
[^26]: Cisco's VoWLAN CAC guide states a G.711 stream uses 538 medium times (1,076 per bidirectional call) out of 31,250 medium times available per AP. Source: [Voice Over Wireless LAN (VoWLAN) Troubleshooting Guide - Troubleshooting Call Admissions Control](https://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/5_Troubleshooting_CAC_Rev1-2.html), Chapter 5, Troubleshooting Call Admissions Control, medium time. Checked 2026-09-25.
[^27]: Cisco describes static CAC as charging a fixed medium time per call against a percentage of the total, while load-based CAC also accounts for channel load, co-channel interference and SNR, which yields more calls. Source: [Voice Over Wireless LAN (VoWLAN) Troubleshooting Guide - Troubleshooting Call Admissions Control](https://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/5_Troubleshooting_CAC_Rev1-2.html), Chapter 5, Troubleshooting Call Admissions Control, static and load-based CAC. Checked 2026-09-25.
[^28]: In Cisco's CAC guide, TSPEC is how a WLAN client requests admission from an AP, using ADDTS action frames at call setup or on re-association. Source: [Voice Over Wireless LAN (VoWLAN) Troubleshooting Guide - Troubleshooting Call Admissions Control](https://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/5_Troubleshooting_CAC_Rev1-2.html), Chapter 5, Troubleshooting Call Admissions Control, TSPEC. Checked 2026-09-25.
[^29]: Cisco's 14 and 20 calls-per-channel figures come from a 2015 guide tied to legacy data rates and G.711 and should not be read as current per-AP capacity for Wi-Fi 6 or later (inferred). Source: [Voice Over Wireless LAN (VoWLAN) Troubleshooting Guide - Troubleshooting Call Admissions Control](https://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/5_Troubleshooting_CAC_Rev1-2.html), Chapter 5, call capacity and medium-time sections; publication date. Checked 2026-09-25.
[^30]: Juniper Mist explains that 802.11r cuts the roaming key exchange from eight messages to four by carrying key exchange in the authentication and association frames. Source: [RSSI, Roaming, and Fast Roaming | Mist](https://www.juniper.net/documentation/us/en/software/mist/mist-wireless/topics/topic-map/rssi-fast-roaming.html), 802.11r (Fast BSS Transition) section. Checked 2026-09-25.
[^31]: Juniper Mist recommends 5 GHz for voice and video and disabling 6 and 9 Mbps rates on 802.11a if possible. Source: [Troubleshooting Wireless Issues (voice and video) | Mist](https://www.juniper.net/documentation/us/en/software/mist/mist-wireless/topics/task/mist-video-voice.html), Voice/video recommendations > radio band and data rates. Checked 2026-09-25.
[^32]: Juniper Mist states that the client, not the AP, decides when to roam; 802.11k neighbor reports and 802.11v suggestions only inform that decision. Source: [RSSI, Roaming, and Fast Roaming | Mist](https://www.juniper.net/documentation/us/en/software/mist/mist-wireless/topics/topic-map/rssi-fast-roaming.html), Roaming section. Checked 2026-09-25.
[^33]: Juniper Mist's voice and video troubleshooting guidance says to disable band steering and let clients choose a band (disputed). Source: [Troubleshooting Wireless Issues (voice and video) | Mist](https://www.juniper.net/documentation/us/en/software/mist/mist-wireless/topics/task/mist-video-voice.html), Voice/video recommendations > band steering. Checked 2026-09-25.
[^34]: Juniper Mist notes that some clients, including Apple iOS phones, do not support Opportunistic Key Caching. Source: [RSSI, Roaming, and Fast Roaming | Mist](https://www.juniper.net/documentation/us/en/software/mist/mist-wireless/topics/topic-map/rssi-fast-roaming.html), OKC section. Checked 2026-09-25.
[^35]: Juniper Mist recommends signal of at least -65 dBm for both client and AP and SNR of at least 25 for voice and video. Source: [Troubleshooting Wireless Issues (voice and video) | Mist](https://www.juniper.net/documentation/us/en/software/mist/mist-wireless/topics/task/mist-video-voice.html), Voice/video recommendations > signal strength and SNR. Checked 2026-09-25.
[^36]: RFC 8325's summary table maps CS3 (the Broadcast Video class) to UP 4 in AC_VI. Source: [RFC 8325: Mapping Diffserv to IEEE 802.11](https://www.rfc-editor.org/rfc/rfc8325.html), Section 4.3, Figure 1. Checked 2026-09-25.
[^37]: RFC 8325 recommends mapping signaling traffic marked CS5 to UP 5 in the Video Access Category (AC_VI). Source: [RFC 8325: Mapping Diffserv to IEEE 802.11](https://www.rfc-editor.org/rfc/rfc8325.html), Section 4.2.2. Checked 2026-09-25.
[^38]: RFC 8325 says packets from wireless clients requesting CS6 or CS7 should be mapped to UP 0 rather than UP 7, and the client OS should re-mark them to DSCP 0. Source: [RFC 8325: Mapping Diffserv to IEEE 802.11](https://www.rfc-editor.org/rfc/rfc8325.html), Section 5.1 (upstream mapping); see also Section 8.2. Checked 2026-09-25.
[^39]: RFC 8325 maps EF (DSCP 46) to 802.11 UP 6, placing voice in the Voice Access Category (AC_VO). Source: [RFC 8325: Mapping Diffserv to IEEE 802.11](https://www.rfc-editor.org/rfc/rfc8325.html), Section 4.2.1. Checked 2026-09-25.
[^40]: RFC 8325 says the default practice of copying the top three DSCP bits into the 802.11 UP produces inconsistent mappings, including putting voice in AC_VI rather than AC_VO. Source: [RFC 8325: Mapping Diffserv to IEEE 802.11](https://www.rfc-editor.org/rfc/rfc8325.html), Section 2.3. Checked 2026-09-25.
[^41]: RFC 8325 recommends mapping VOICE-ADMIT (DSCP 44) to UP 6 as well. Source: [RFC 8325: Mapping Diffserv to IEEE 802.11](https://www.rfc-editor.org/rfc/rfc8325.html), Section 4.2.1. Checked 2026-09-25.
[^42]: Published Wi-Fi voice signal targets differ by vendor and device class (Cisco -67 dBm for handsets, Juniper Mist -65 dBm, Microsoft -60 dBm for Teams Rooms), so a design should meet the strictest target among the devices it must support (inferred). Source: [Prepare your environment for Teams Rooms](https://learn.microsoft.com/en-us/microsoftteams/rooms/rooms-prep), Wireless network considerations, compared with Cisco 8821 troubleshooting and Juniper Mist voice/video pages. Checked 2026-09-25.
[^43]: Microsoft says 5 GHz is better suited to real-time media than 2.4 GHz but needs more access points for coverage, and endpoints must support and be configured for it. Source: [Prepare your organization's network for Microsoft Teams](https://learn.microsoft.com/en-us/microsoftteams/prepare-network), Network optimization table > Optimize WiFi. Checked 2026-09-25.
[^44]: Microsoft's Teams network guidance says to consider band steering on dual-band Wi-Fi to push clients to 5 GHz (disputed). Source: [Prepare your organization's network for Microsoft Teams](https://learn.microsoft.com/en-us/microsoftteams/prepare-network), Network optimization table > Optimize WiFi. Checked 2026-09-25.
[^45]: Microsoft says neighbouring access points should be on non-overlapping channels to avoid co-channel competition. Source: [Prepare your organization's network for Microsoft Teams](https://learn.microsoft.com/en-us/microsoftteams/prepare-network), Network optimization table > Optimize WiFi. Checked 2026-09-25.
[^46]: Microsoft says Teams Rooms devices and at least one access point should see each other at -60 dBm or better. Source: [Prepare your environment for Teams Rooms](https://learn.microsoft.com/en-us/microsoftteams/rooms/rooms-prep), Wireless network considerations. Checked 2026-09-25.
[^47]: Microsoft's Teams Rooms guidance says to enable band steering so 5 GHz gets priority when it shares an SSID with 2.4 GHz (disputed). Source: [Prepare your environment for Teams Rooms](https://learn.microsoft.com/en-us/microsoftteams/rooms/rooms-prep), Wireless network considerations. Checked 2026-09-25.
[^48]: Microsoft's Teams Rooms guidance says to keep wireless channel utilization below 50 percent. Source: [Prepare your environment for Teams Rooms](https://learn.microsoft.com/en-us/microsoftteams/rooms/rooms-prep), Wireless network considerations. Checked 2026-09-25.
[^49]: Microsoft strongly recommends wired rather than wireless connections for Teams Rooms devices. Source: [Prepare your environment for Teams Rooms](https://learn.microsoft.com/en-us/microsoftteams/rooms/rooms-prep), Wireless network considerations, first paragraph. Checked 2026-09-25.
[^50]: Microsoft's Teams network guidance says to implement QoS or WMM so media is prioritized over Wi-Fi. Source: [Prepare your organization's network for Microsoft Teams](https://learn.microsoft.com/en-us/microsoftteams/prepare-network), Network optimization table > Optimize WiFi. Checked 2026-09-25.
[^51]: Cisco's VoWLAN troubleshooting guide gives -67 dBm as the optimal VoWLAN cell-edge signal. Source: [Voice Over Wireless LAN (VoWLAN) Troubleshooting Guide - Site Survey and RF Design Validation](https://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/8_Site_Survey_RF_Design_Valid.html), Chapter 8, Site Survey and RF Design Validation, RF design parameters. Checked 2026-09-25.
[^52]: Cisco's VoWLAN guide calls for at least 20 percent cell overlap at 2.4 GHz and 15 to 20 percent at 5 GHz between access points on different channels. Source: [Voice Over Wireless LAN (VoWLAN) Troubleshooting Guide - Site Survey and RF Design Validation](https://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/8_Site_Survey_RF_Design_Valid.html), Chapter 8, Site Survey and RF Design Validation, cell overlap. Checked 2026-09-25.
[^53]: Cisco's VoWLAN guide says overall channel utilization should be less than 50 percent. Source: [Voice Over Wireless LAN (VoWLAN) Troubleshooting Guide - Site Survey and RF Design Validation](https://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/8_Site_Survey_RF_Design_Valid.html), Chapter 8, Site Survey and RF Design Validation, channel utilization. Checked 2026-09-25.
[^54]: Cisco's VoWLAN guide says packet loss should stay under 1 percent and jitter under 100 ms. Source: [Voice Over Wireless LAN (VoWLAN) Troubleshooting Guide - Site Survey and RF Design Validation](https://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/8_Site_Survey_RF_Design_Valid.html), Chapter 8, Site Survey and RF Design Validation, packet loss and jitter. Checked 2026-09-25.
[^55]: Cisco's VoWLAN guide says WCS predictive heat maps must not be used as a pre- or post-deployment site survey tool, and recommends physical walk-through measurement with survey and spectrum tools. Source: [Voice Over Wireless LAN (VoWLAN) Troubleshooting Guide - Site Survey and RF Design Validation](https://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/8_Site_Survey_RF_Design_Valid.html), Chapter 8, Site Survey and RF Design Validation, survey tools. Checked 2026-09-25.
[^56]: Cisco's VoWLAN guide says the noise floor should not exceed -92 dBm so that a -67 dBm cell edge yields a 25 dB SNR. Source: [Voice Over Wireless LAN (VoWLAN) Troubleshooting Guide - Site Survey and RF Design Validation](https://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/8_Site_Survey_RF_Design_Valid.html), Chapter 8, Site Survey and RF Design Validation, RF design parameters. Checked 2026-09-25.
[^57]: Cisco's VoWLAN guide says retransmissions should be kept under 20 percent. Source: [Voice Over Wireless LAN (VoWLAN) Troubleshooting Guide - Site Survey and RF Design Validation](https://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/8_Site_Survey_RF_Design_Valid.html), Chapter 8, Site Survey and RF Design Validation, retransmissions. Checked 2026-09-25.
[^58]: Wi-Fi Alliance describes Wi-Fi CERTIFIED Voice-Enterprise as building on WMM, WMM-Admission Control and WMM-Power Save to keep voice quality consistent while roaming across multiple APs. Source: [Wi-Fi CERTIFIED Voice-Enterprise (Performance)](https://www.wi-fi.org/discover-wi-fi/wi-fi-certified-voice-enterprise), Voice-Enterprise program description. Checked 2026-09-25.
[^59]: Under WMM-Admission Control a client sends a TSPEC request, the AP grants medium time only if network load and channel conditions allow, and a rejected client may not start that traffic stream. Source: [How does WMM-Admission Control work?](https://wi-fi.org/knowledge-center/faq/how-does-wmm-admission-control-work), FAQ answer: How does WMM-Admission Control work?. Checked 2026-09-25.