Source note · Passing call context with SIP UUI and custom headers
Before SIP X header support, the SIP UUI field with a 128-character limit was the only way to pass call context in Dynamics 365 Contact Center.
Checked 2026-10-02
Previously, the SIP UUI field—with its 128-character limit—was the only method available for passing call context.
- Vendor
- Microsoft
- Product
- Dynamics 365 Contact Center
- Subsystem
- voice context transfer
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- before GA 2026-02-23 for the exclusivity; UUI limit current
- Checked
- 2026-10-02
Sources
- Enable SIP X header support for context transfer — Microsoft · tier 2 current vendor documentation · Feature details, second paragraph
Cite this note
APA
WarmTransfer. (2026, October 2). Passing call context with SIP UUI and custom headers: source note sip-uui-context-passing-d365-uui-128-char-limit. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-uui-context-passing-d365-uui-128-char-limit
BibTeX
@misc{warmtransfer-claim-sip-uui-context-passing-d365-uui-128-char-limit,
title = {Passing call context with SIP UUI and custom headers: source note sip-uui-context-passing-d365-uui-128-char-limit},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-uui-context-passing-d365-uui-128-char-limit},
note = {Source note sip-uui-context-passing-d365-uui-128-char-limit, checked 2026-10-02}
}