We are using Snomone Blue 4.5.0.1075 Delta Aurigids (Win64) softpbx and with SIP trunk with Aastra MX-ONE TSE. Some calls from Snomone to Aastra direction may be suspended. When we try to terminate this type of calls in active calls page, these calls can not be terminated. During this problem new calls can not be taken on ACD queues. How can we terminate this type of calls and why this problem occurres.