IAX trunks "Unreachable"

A.Salah
Posts: 99
Member Since:
2011-02-16

we have 4 or 5 IAX trunks connecting our offices
trunks are working fine
but suddenly 1 or 2 or all go down
unreachable
when I make a rebuild(Apply Configuration Changes)
trunks start working again

can any body help about this by solving the problem???
or by setting a time automated system rebuild ( every specific period of time)??