asterisk users - Sep 2008 - Call-Limit on Asterisk Cluster

Hi All,

i have 3 asterisk server in a cluster using a cluster of mysql server 
via realtime, users can register via DNS SRV.

I send/receive calls to an AS5400 via a SIP trunk defined on the 
realtime sip table, the trunk has call-limit=5. Problem i encountered is 
  each of the 3 asterisk servers will 5 channels each to them instead of 
5 for all 3 servers.

Is there any solution to this?

Regards,
Nhadie