The tmnxMobServUeTable has an entry for an User Equipment (UE)
being served by this gateway.
There will not be more than one row in this table. Whenever a new row
is created, existing row will be deleted and then new row will be
created.
This table will only have an entry for a UE served by the gateways,
identified by TIMETRA-MOBILE-GATEWAY-MIB::tmnxMobGwId, where the value
of TIMETRA-MOBILE-GATEWAY-MIB::tmnxMobGwType is equal to 'sgw'.