Source note · SIP early offer and delayed offer
Because Best Effort (no MTP inserted) never adds an MTP, a Unified CM trunk set that way cannot guarantee an Early Offer when the call arrives from a Delayed Offer source, so a peer that rejects Delayed Offer needs either the Mandatory (insert MTP if needed) option or DO-EO conversion downstream.
inferred · Checked 2026-09-25
- Vendor
- Cisco
- Product
- Unified CM
- Subsystem
- sip-profile
- Deployment
- on-premises
- Region
- not restricted
- Release range
- unverified for current releases
- Status
- inferred
- Checked
- 2026-09-25
Sources
- Cisco Unified Communications Manager Trunks (Session Management Edition deployment guide 8.6(1)) — Cisco · tier 2 current vendor documentation · SIP Delayed Offer and Early Offer > SIP Early Offer support; combined with cisco-help-xmsy7d-edge-audio-config section '(Optional) Set Early Offer Support for Voice and Video Calls'
Cite this note
APA
WarmTransfer. (2026, September 25). SIP early offer and delayed offer: source note sip-early-delayed-offer-inf-best-effort-not-guaranteed. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-early-delayed-offer-inf-best-effort-not-guaranteed
BibTeX
@misc{warmtransfer-claim-sip-early-delayed-offer-inf-best-effort-not-guaranteed,
title = {SIP early offer and delayed offer: source note sip-early-delayed-offer-inf-best-effort-not-guaranteed},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-early-delayed-offer-inf-best-effort-not-guaranteed},
note = {Source note sip-early-delayed-offer-inf-best-effort-not-guaranteed, checked 2026-09-25}
}