AudioCodes Mediant 4000 SBC User Manual page 229

CHAPTER 16 Services
Mediant 4000 SBC | User's Manual
The device can send recorded SBC calls to multiple SRSs. To achieve this, you can configure up
to three groups of SRSs, where each group can contain one SRS (standalone), or two SRSs
operating in an active-standby (1+1) mode for SRS redundancy. The device sends both SIP
signaling and RTP to all standalone SRSs.
For SRS redundancy, the device sends SIP signaling to all SRSs (active and standby), but sends
RTP only to the active SRSs. If during a recorded call session, the standby SRS detects that the
active SRS has gone offline, the standby SRS sends a re-INVITE to the device and the device then
sends the recorded RTP to the standby SRS instead (which now becomes the active SRS). For
new calls, if the device receives no response or a reject response from the active SRS to its' sent
INVITE message, the device sends the recorded call to the standby SRS.
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