Billion BiPAC 7401VGP R3 User Manual page 118

If you only dial 97070, the number that is dialed out via FXO port for making a regular call will not
have its prefix. Even though 7070 (only 4 digits) does not match the number of digit defined in the
field, 7070 is still a valid phone number since it has not exceeded the number of digit defined.
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