Network Requirements for Webex Services

Publisher

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

URL

https://help.webex.com/en-us/article/WBX000028782/Network-Requirements-for-Webex-Services

Published

2026-09-09

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

• Webex apps and Cisco video devices use UDP ports 5004 and 9000 for media, with TCP 5004 and then TLS 443 as fallbacks. in context
• The Webex services network requirements page, as fetched on 2026-09-25, contains no section on QoS or DSCP marking and no guidance on VPN or split tunnelling for media. inferred in context
• Cisco prefers UDP for Webex voice and video media. When media falls back to TCP, retransmission and receiver buffering show up as increased latency and jitter that degrade call quality. in context
• Cisco warns that Webex media sent over TLS through a configured proxy server can create bandwidth bottlenecks and packet loss, and strongly recommends against TLS media transport in production. in context
• Cisco states that Webex media flows in both directions using a symmetric inside-initiated 5-tuple stream outbound to the Webex cloud, where the 5-tuple is source IP address destination IP address source port destination port and protocol. in context
• Cisco states that in preference order Webex apps and Cisco Video devices support UDP TCP and TLS as media transport protocols, that they fall back to TCP if UDP ports are blocked by the firewall and to TLS if TCP ports are blocked, and that it prefers and strongly recommends UDP for all Webex voice and video media streams in line with RFC 3550. in context
• Cisco names AES-CM-128-HMAC-SHA1 as the cipher typically used to encrypt media to Webex services from endpoints using SRTP with SIP signalling and describes it as a mature cipher with proven interoperability between vendors, and the Webex Calling security requirements article gives AES_CM_128_HMAC_SHA1_80 as the only SRTP key supported for secure media. in context
• Cisco states that where TLS is used as the media transport protocol by Webex apps and Cisco Video devices with a configured proxy server the media is routed through that proxy, which can create bandwidth bottlenecks and subsequent packet loss, and strongly recommends that TLS is not used to transport media in production environments. in context
• Cisco's Network Requirements for Webex Services article dated 9 September 2026 states that the Webex app and Cisco Video devices use STUN (RFC 5389) for firewall traversal and media node reachability testing, citing a specification that RFC 8489 obsoleted in February 2020. field report in context
• Webex services use ports 5004 and 9000 with SRTP over UDP for encrypted audio, video and content sharing, and fall back to TCP and then TLS when UDP cannot be used. in context
• Cisco recommends UDP for Webex media, with a preference order of UDP, then TCP, then TLS, and strongly recommends against TLS for media in production because of possible quality loss, including proxy bottlenecks. in context
• The Webex network requirements article gives no numeric packet loss, jitter or latency targets for media. inferred in context
• Cisco strongly recommends that TLS not be used to transport Webex media in production because of further quality degradation from proxy bottlenecks. in context
• Cisco strongly recommends UDP for all Webex voice and video media and warns that TCP fallback retransmission and buffering show up as increased latency and jitter. in context

Cite this source record

APA

WarmTransfer. (2026, September 9). Network Requirements for Webex Services. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-help-wbx28782-network-requirements

BibTeX

@misc{warmtransfer-cisco-help-wbx28782-network-requirements,
  title  = {Network Requirements for Webex Services},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-help-wbx28782-network-requirements},
  note   = {Cisco Systems, Inc. (help.webex.com), accessed 2026-09-16}
}