ErrMgs=29 - SRTP Error - failed decrypting RTCP packet

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  Hi,
  We have setup Audiocodes mediant 1K ESBC SIP trunk with SFB FE POOL (collocated). there is SIP PSTN connected for external calls.
  Now we can see flood of these alerts being generated for all SFB EV inc & out calls "SRTP Error - failed decrypting RTCP packet"
  
  06:04:05.743  *SBC IP*     local0.warn    [S=32962412] [SID=a84682:23:336333]  ErrMgs=8 -- Invalid RTP SSRC number = 0X60EF058D, expected SSRC=0X1DA2F1E3 [Code:0x3700e] [CID:123] [Time:13-11@06:04:04.507]
  06:04:06.823  *SBC IP*     local0.warn    [S=32962416] [SID=a84682:23:336333]  ErrMgs=29 -- SRTP Error - failed decrypting RTCP packet (PacketLength=43, PayloadLength=0): wrong SSRC (11) [Code:0x3700e] [CID:259] [Time:13-11@06:04:05.592]
  06:04:07.625  *SBC IP*     local0.warn    [S=32962417] [SID=a84682:23:336333]  SRTCP_SSRC_ERROR:2  [Code:0x5004] [CID:259] [Time:13-11@06:04:06.402]                                                                                  
  06:04:10.101  *SBC IP*     local0.warn    [S=32962509] [SID=a84682:23:336333]  ErrMgs=29 -- SRTP Error - failed decrypting RTCP packet (PacketLength=139, PayloadLength=0): wrong SSRC (11) [Code:0x3700e] [CID:259] [Time:13-11@06:04:08.842]06:04:10.632  *SBC IP*     local0.warn    [S=32962510] [SID=a84682:23:336333]  SRTCP_SSRC_ERROR:1  [Code:0x5004] [CID:259] [Time:13-11@06:04:09.402]
  06:04:10.695  *SBC IP*     local0.warn    [S=32962511] [SID=a84682:23:336333]  ErrMgs=29 -- SRTP Error - failed decrypting RTCP packet (PacketLength=43, PayloadLength=0): wrong SSRC (11) [Code:0x3700e] [CID:259] [Time:13-11@06:04:09.462]                                                                                  
  06:04:21.319  *SBC IP*     local0.warn    [S=32962754] [SID=a84682:23:336333]  ErrMgs=29 -- SRTP Error - failed decrypting RTCP packet (PacketLength=183, PayloadLength=0): wrong SSRC (11) [Code:0x3700e] [CID:259] [Time:13-11@06:04:20.087]
  06:04:21.648  *SBC IP*     local0.warn    [S=32962755] [SID=a84682:23:336333]  SRTCP_SSRC_ERROR:1  [Code:0x5004] [CID:259] [Time:13-11@06:04:20.407]                                                                                  
  06:04:11.632  *SBC IP*     local0.warn    [S=32962629] [SID=a84682:23:336333]  SRTCP_SSRC_ERROR:4  [Code:0x5004] [CID:259] [Time:13-11@06:04:10.402]
  
  Also there are many CPU overload alarms (shown below) which gets cleared automatically.
  
  Alarm Name: System Component Overloaded
  Source: Board#1
  Source Description: 0
  Severity: major
  Alarm Type: processingErrorAlarm
  Alarm Probable Cause : congestion
  Description: Board overload alarm During the last 1 second SYSTEM CPU was overloaded.
  
  However we dont see any major issues with actual calls. Any help would be appreciated.
  
  Regards,
  Ajit

  Tuesday, November 13, 2018 6:54 AM