Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - Mid-call Signaling

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_voi-cube-midcall-reinvite.html

Published

unknown

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco documentation terms; no-redistribution; short excerpts and locators only

Source notes citing this source

• The CUBE mid-call signaling guide says re-INVITEs are not consumed when media flow-around or media anti-tromboning is configured. in context
• The CUBE mid-call signaling guide lists Multicast Music On Hold (MMOH) as not supported. in context
• On CUBE with midcall-signaling passthru media-change mid-call re-INVITEs are passed through only when bidirectional media such as T.38 fax or video is added. in context
• On CUBE midcall-signaling preserve-codec disables mid-call codec negotiation and keeps the codec negotiated at call setup. in context
• midcall-signaling block blocks all mid-call media-related signaling to the SIP trunk, rejects video escalation and T.38, and Cisco says to configure it only when basic calling is the focus and mid-call signaling can be consumed. in context
• With midcall-signaling block and media flow-around both configured, CUBE rejects a mid-call INVITE with a 488 error. in context
• CUBE mid-call signaling modes can be set globally under voice service voip > sip (midcall-signaling ...) or per dial peer (voice-class sip midcall-signaling ...). in context
• CUBE's mid-call signaling feature exists to reduce interoperability problems by consuming mid-call re-INVITEs and UPDATEs instead of forwarding them; it offers three modes: passthru media-change, block and preserve-codec. in context
• With midcall-signaling passthru media-change, CUBE passes a re-INVITE to the other leg only when bidirectional media such as T.38 or video is added, and consumes re-INVITEs that only change media direction. in context
• In passthru media-change mode, re-INVITEs are not consumed when media flow-around or media anti-tromboning is configured, and SDP passthrough, video transcoding and multicast music on hold are unsupported. in context
• midcall-signaling preserve-codec disables mid-call codec negotiation and keeps the codec negotiated before the call. in context
• When CUBE mid-call signaling consumption is configured, session timer handling is done leg by leg. in context

Cite this source record

APA

WarmTransfer. (2026, September 24). Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - Mid-call Signaling. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cube-midcall-signaling-iosxe

BibTeX

@misc{warmtransfer-cisco-cube-midcall-signaling-iosxe,
  title  = {Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - Mid-call Signaling},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cube-midcall-signaling-iosxe},
  note   = {Cisco Systems, accessed 2026-09-24}
}