When no value has been assigned to a particular
cgkLZoneSessionBandwidth entry i.e. its value is -1, then
this value defines the maximum bidirectional bandwidth which
a gatekeeper can allocate to a call in that zone.
This value represents the total bidirectional data flow
in units of hundreds bits per second (bps). A value of 10 is
1000bps.
A value of -1 indicates no bandwidth limitation has been set.