Man pages matching name netsds::feature::kannel in section 3pm:

NetSDS::Feature::Kannel.3pm.en	debian 10 / libnetsds-kannel-perl
NetSDS::Feature::Kannel.3pm.en	debian 11 / libnetsds-kannel-perl
NetSDS::Feature::Kannel.3pm.en	debian 12 / libnetsds-kannel-perl