SMPP enquire_link and failover

[P. A. Bagyenda]

Hi,

 I notice that the enquire_link message is sent every so often by the
SMPP code, but I don't seem to see anywhere that any errors are checked
for and used to update the list of SMSCs. This makes failover a bit of a
problem. Best attack point for fix, if this is a bug?

Paul.