The maxAddrLenExceeded attribute counts how often the
concatenation of the secondary address and the suffix digits from
the original called address have exceeded the maximum of 15
digits.
The suffix digits can be determined by removing the primary
address digits from the front of the original called address.
If appending the suffix digits to a secondary address causes the
resulting address to exceed 15 digits, this secondary member is
skipped and the next secondary member is tried.