Source note · Passing call context with SIP UUI and custom headers
RFC 7434 expects that a limit of 128 octets of UUI data plus the protocol discriminator can be imposed on isdn-uui data.
Checked 2026-10-02
It is reasonable to expect that a limitation of 128 octets (plus a protocol discriminator) can be imposed
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- ISDN UUI interworking
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 7434
- Checked
- 2026-10-02
Sources
- RFC 7434: Interworking ISDN Call Control User Information with SIP — IETF / RFC Editor · tier 1 standards and regulators · Sections 3.1 and 7
Cite this note
APA
WarmTransfer. (2026, October 2). Passing call context with SIP UUI and custom headers: source note sip-uui-context-passing-rfc7434-128-octet-limit. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-uui-context-passing-rfc7434-128-octet-limit
BibTeX
@misc{warmtransfer-claim-sip-uui-context-passing-rfc7434-128-octet-limit,
title = {Passing call context with SIP UUI and custom headers: source note sip-uui-context-passing-rfc7434-128-octet-limit},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-uui-context-passing-rfc7434-128-octet-limit},
note = {Source note sip-uui-context-passing-rfc7434-128-octet-limit, checked 2026-10-02}
}