Unfortunately, currently for "Sending" only UUI is available.
For incoming calls, we can use "Get Raw SIP Headers" or "Get SIP Headers".
I found the articles below on the ideas portal.
Unfortunately, for now, the status is "Future Considerations".
https://genesyscloud.ideas.aha.io/ideas/SSAAOB-I-365
https://genesyscloud.ideas.aha.io/ideas/INB-I-571
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Kaio Oliveira
GCP - GCQM - GCS - GCA - GCD - GCO - GPE & GPR - GCWM
PS.: I apologize if there are any mistakes in my English; my primary language is Portuguese-Br.
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Original Message:
Sent: 02-23-2026 23:25
From: Mutthukumar GM
Subject: How to set dynamic values to custom SIP headers in Genesys Cloud CX (not through x‑User‑To‑User in Set UUI Data action)? Is that possible?
Context for the Community
- In Genesys Cloud CX, the Set UUI Data action in Architect flows allows you to embed values into the
x‑User‑To‑User header. - This works fine for passing ABC/XYZ or other participant data, but it results in values being encapsulated inside
x‑User‑To‑User rather than appearing as standalone custom SIP headers. - The requirement is to send dynamic values directly into custom SIP headers (e.g.,
X‑ABC, X‑XYZ) without relying on x‑User‑To‑User.
What I've Observed
- External Trunk configuration supports adding custom SIP headers, but those are static values only - they don't resolve Architect variables at runtime.
- Architect Transfer to External Number/Trunk actions allow adding SIP headers, but again, the binding options are limited.
- Documentation suggests that outbound dynamic headers are generally supported only via UUI (
x‑User‑To‑User).
Clarification Needed
- Is there a supported way to bind dynamic participant data variables directly into custom SIP headers (e.g.,
X‑ABC, X‑XYZ) in Architect? - If not natively supported, is the recommended approach to continue using
Set UUI Data and encapsulate values inside x‑User‑To‑User? - Are there any roadmap items or workarounds that allow dynamic custom SIP headers outside of UUI?
#ArchitectFlow #ExternalTrunk #SIP #SIPHeader #customSIP header
#ArchitectandDesign
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GM
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