RFC 8688: A Session Initiation Protocol (SIP) Response Code for Rejected Calls

Publisher

IETF / RFC Editor

URL

https://www.rfc-editor.org/rfc/rfc8688.html

Published

2019-12-01

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

IETF Trust Legal Provisions; short excerpts and locators only

Source notes citing this source

• RFC 8688 defines SIP 608 (Rejected) for an intermediary, such as a call analytics engine, that blocked the call; it can carry a jCard in Call-Info giving the intermediary operator's contact for redress. in context
• RFC 8688 defines 608 Rejected so that a calling party can learn that an intermediary, rather than the called party, rejected the call attempt. in context
• RFC 8688 requires that a Call-Info header field in a 608 response carry the purpose parameter jwscard and refer to a valid JWS encoding of a jCard, giving a blocked caller a contact for redress. in context

Cite this source record

APA

WarmTransfer. (2019, December 1). RFC 8688: A Session Initiation Protocol (SIP) Response Code for Rejected Calls. WarmTransfer. https://warmtransfer.net/knowledge/sources/rfc-8688-sip-608-rejected

BibTeX

@misc{warmtransfer-rfc-8688-sip-608-rejected,
  title  = {RFC 8688: A Session Initiation Protocol (SIP) Response Code for Rejected Calls},
  author = {{WarmTransfer}},
  year   = {2019},
  url    = {https://warmtransfer.net/knowledge/sources/rfc-8688-sip-608-rejected},
  note   = {IETF / RFC Editor, accessed 2026-09-24}
}