Do you know if there is some unexpected SIP messages which are being sent to the system that are not being handled during runtime? Meaning likes of OPTIONS, or NOTIFY? Potentially some scenario is resulting in loss of internal call objects of legs, that is not allowing additional SIP calls once prior calls were answered. Hard to say without seeing the actual logs though. Also note, Su165 is quite old, and it may help to upgrade to later SU to see if behaviors changes. Regards, Jeff
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