ATIS T1.621

Integrated Services Digital Network (ISDN) - User-to-User Signaling Supplementary Service

Org/Number ID	ATIS T1.621
Alternate Organization ID / number	ANSI T1.621
Version(s)	1992
Bin #	0563
Comments
Status	Present
Record last updated	September 7, 2022, 3:21 pm

This is not the most recent edition of this standard.

Newer edition note: 2009; 2014; 2019