Outbound sip calling issue

ever since I upgraded to 2.2beta2 I am having intermittent issues in outbound calling via SIP/IAX trunks. I have a voipcheap trunk and a voxee trunk… The problem seems to be transient and when it happens I am unable to make any calls. The logs show that the Channel is unavailable - for both the SIP and IAX - it seems like the call actually connects, and then disconnects for each trunk. Wonder if it has to do with the call counter incrementing and decrementing correctly.

Is anyone else seeing any instability in outbound trunks and calling?