Source note · SIP early offer and delayed offer
As documented in 2013, CUCM supported reliable provisional responses only as a UAC sending PRACK and could not itself send 180/183 with Require: 100rel as a UAS.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Unified CM
- Subsystem
- sip-trunk
- Deployment
- on-premises
- Region
- not restricted
- Release range
- as documented 2013-05-16; current releases unverified
- Checked
- 2026-09-25
Sources
- SIP Reliable Provisional Response on CUBE and CUCM Configuration Example — Cisco Systems · tier 2 current vendor documentation · Configure > CUCM (note on UAS support)
Cite this note
APA
WarmTransfer. (2026, September 25). SIP early offer and delayed offer: source note sip-early-delayed-offer-tn116086-cucm-uas-limit-2013. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-early-delayed-offer-tn116086-cucm-uas-limit-2013
BibTeX
@misc{warmtransfer-claim-sip-early-delayed-offer-tn116086-cucm-uas-limit-2013,
title = {SIP early offer and delayed offer: source note sip-early-delayed-offer-tn116086-cucm-uas-limit-2013},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-early-delayed-offer-tn116086-cucm-uas-limit-2013},
note = {Source note sip-early-delayed-offer-tn116086-cucm-uas-limit-2013, checked 2026-09-25}
}