Cisco Unified Border Element Configuration Guide: Consumption of Forked 18x Responses with SDP During Early Dialog

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/voi-cube-forked-18x-responses.html

Published

2026-04-25

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

• CUBE's forked 18x handling is controlled with voice-class sip early-media update block (dial-peer) or early media update block (global SIP), with an optional re-negotiate keyword to renegotiate media after connect. in context
• CUBE's forked 18x consumption does not support Delayed-Offer to Delayed-Offer calls, SDP passthrough, SRTP passthrough, ANAT, media flow-around, media anti-trombone or early-dialog UPDATE block. in context
• From IOS XE Denali 16.3.1, if the inbound leg does not support PRACK or UPDATE, CUBE by default consumes multiple forked 18x responses with SDP received during the early dialog. in context

Cite this source record

APA

WarmTransfer. (2026, April 25). Cisco Unified Border Element Configuration Guide: Consumption of Forked 18x Responses with SDP During Early Dialog. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cube-forked-18x-responses

BibTeX

@misc{warmtransfer-cisco-cube-forked-18x-responses,
  title  = {Cisco Unified Border Element Configuration Guide: Consumption of Forked 18x Responses with SDP During Early Dialog},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cube-forked-18x-responses},
  note   = {Cisco Systems, accessed 2026-09-24}
}