cid (Content Identifier)
cid (Content Identifier [Content‑ID]) is an identifier used to refer to a MIME (Multipurpose Internet Mail Extensions) block.
Relevant NENA Documents
Note: To find and download the document, copy the document number (like NENA-STA-010) from below and search the NENA Standards and Documents page.
NENA-STA-010, Detailed Functional and Interface Standards for the NENA i3 Solution