Specifications

- 5 -
AS/CA S002:2010 COPYRIGHT
OCTOBER 2010
Publication Title
ITU–T and CCITT Recommendations
[12] Annex to ITU
Operational Bulletin Nr.
781 – 1.II.2003
Various tones used in national networks
(According to ITU-T Recommendation
E.180)(03/1998)
[13] E.161 (02/2001) Arrangement of digits, letters and
symbols on telephones and other
devices that can be used for gaining
access to a telephone network
[14] E.164 (02/2005) The international public
telecommunication numbering plan
[15] G.122 (03/1993) Influence of national systems on stability,
talker echo, and listener echo in
international connections
[16] G.223 (11/1988) Assumptions for the calculation of noise
on hypothetical reference circuits for
telephony
[17] O.9 (03/1999) Measuring arrangements to assess the
degree of unbalance about earth
[18] O.41 (10/1994) Psophometer for use on telephone-type
circuits
[19] O.71 (11/1988) Impulsive noise measuring equipment
for telephone-type circuits
[20] Q.23 (11/1988) Technical features of push-button
telephone sets
[21] V.18 (11/2000) Operational and interworking
requirements for DCEs operating in the
text telephone mode
[22] V.25 (10/1996) Automatic answering equipment
and/or parallel automatic calling
equipment on the general switched
telephone network including
procedures for disabling of echo control
devices for both manually and
automatically established calls