AudioCodes Mediant 4000 SBC User Manual page 778

Note:
•
The feature does not support SIPRec messages and REGISTER messages.
•
For HA systems, during a switchover the device stops sending the SIP call flow
messages of current SIP dialogs and continues sending them after the switchover
(even though OVOC does not display the continuation of the call after switchover).
•
If the device experiences a CPU overload, it stops sending SIP call flow messages
to OVOC until the CPU returns to normal levels.
User's Manual 778
Mediant 4000 SBC
Document #: LTRT-40203