Only waiting for agent channel to hangup.

Only waiting for agent channel to hangup.

If the member do an attended transfer this loop stops and
the agent is set to Available state again, when in fact he still
busy with other channel.

This was happening, for example, when a member calls support queue, then
the support operator do an attended transfer to sales queue, while the sales
operator is talking the member that was transferred, the sales queue will
send calls to the operator, which is not expected.