Source note · SS7 and carrier interworking concepts
RFC 3204 says that when the Content-Disposition handling parameter is absent on an ISUP or QSIG body, handling=required is assumed, so a UAS that does not understand the body returns 415 Unsupported Media Type; with handling=optional the UAS ignores it.
Checked 2026-09-24
If the handling parameter is missing, the value 'required' is to be assumed.
- Vendor
- IETF
- Product
- SIP-T
- Subsystem
- Content-Disposition handling
- Deployment
- carrier
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- RFC 3204: MIME media types for ISUP and QSIG Objects — RFC Editor / IETF · tier 1 standards and regulators · Section 6
Cite this note
APA
WarmTransfer. (2026, September 24). SS7 and carrier interworking concepts: source note ss7-carrier-interworking-handling-default-required. WarmTransfer. https://warmtransfer.net/knowledge/claims/ss7-carrier-interworking-handling-default-required
BibTeX
@misc{warmtransfer-claim-ss7-carrier-interworking-handling-default-required,
title = {SS7 and carrier interworking concepts: source note ss7-carrier-interworking-handling-default-required},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/ss7-carrier-interworking-handling-default-required},
note = {Source note ss7-carrier-interworking-handling-default-required, checked 2026-09-24}
}