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C.3 UK Telephone Number Blacklist
In most countries there are rules relating to how often and what time
intervals should elapse between dialling attempts. This blacklist is only
operational for dial-up (PSTN) applications. Below is the definition of the
telephone number blacklist rules for your modem when supplied for use in
the UK.
When the dial command includes the
U
modifier (automatic re-dial), the
number is placed on the blacklist the moment it is dialled, and cleared only
if the call is successful, i.e. the call results in a
CONNECT message. Up to
20 numbers can be contained in this blacklist at one time. Should this
limit be exceeded then the blacklist will need to be cleared before the PSTN
autodialling operation can continue.
The following rules apply to numbers entered on the blacklist.
i) After one unsuccessful connection attempt, ten seconds will elapse
before a second dial command for the same number can be executed.
ii) After a second unsuccessful connection attempt, 120 seconds will
elapse before a third dial for the same number can be executed.
iii) Another four attempts are allowed at 120 second intervals.
iv) Should all seven attempts to dial a number be unsuccessful, the
modem will be disabled from calling that number again until the
four-hour timer has elapsed.
v) Any attempt to redial the telephone number during a blacklisted
period will result in a
BLACKLIST response.
Note: These rules do not apply to manual redialling on the PSTN (using
AT commands, or front panel buttons), nor to connections on leased lines.
When external Communication Software is used to control the modem,
automatic redialling must conform to the above rules and the requirements
of BABT/SITS/82/005S/D and BABT/SITS/82/01/C.
X460-306851 Issue 1 C-7 Rev.0