Multiple open IAX2 channels when no active calls between servers

Hello All,

I have noticed recently a problem with active open IAX2 channels on one of two servers connected IAX2 trunk.

When no calls are made I see a lot of active IAX2 channels still open. resetting server helps but after I made a couple calls to the other server through IAX trunk, the active IAX channels are still open and that amount grows every time I make interserver call. The problem is only with one of two servers.

I put trunk=yes on both ends.

Could you please advice. Both servers are Trixboxes

Thank You