Cross References:
ITU-T Y.1241 (2001)
ITU-T Y.2022 (2011)
ITU-T Y.2052 (2008)
ITU-T Y.2057 (2011)
ITU-T Y.2720 (2009)
ITU-T Y.3031 (2012)
IETF RFC 4140
IETF RFC 1498
IETF RFC 1955
ISO/IEC TR 29181-1
IETF STD 13, RFC 1034 (1987)
IETF RFC 3403 (2002)
IETF RFC 6116 (2011)
IETF RFC 6830 (2013)
ITU-T E.164 (2010)
ITU-T Y.2091 (2011)
ITU-T Y.2015 (2011)
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