SBC - Packets Discarded

[Evgeniy Bagretsov]

[toc:faq]

Hi,

Cisco Session Border Contorller on ASR1006

sh sbc 1 dbe media-flow-stats detail context 7640768

SBC Service "1"

  Media Flow:

    Context ID:          7640768

    Stream ID:           49153

    State of Media Flow: Active

    Call Established Time: 17:21:12 KRGZ Jul 15 2016

    Flow Priority:       Routine

    Side A:

      Name                       

      Reserved Bandwidth:         10500 (bytes/second)

      Status                      InService

      VRF Name:                   SBC-Core

      VLAN Tags(Priorities):      0(0), 0(0)

      Local Address:              10.10.10.10

      Local Port:                 31200

      Remote Address:             10.20.20.20

      Remote Port:                28038

      Port Range Tag: <None>

      Packets Received:           142492

      Packets Sent:               167

      Packets Discarded:          21

      Data Received:              28498400 (bytes)

      Data Sent:                  33400 (bytes)

      Data Discarded:             4200 (bytes)

      GM Discarded Packets:       0

      Time To Recovery:           Not known

      EndPoint Packets Sent:          30241

      EndPoint Packets Received:      0

      EndPoint Packets Lost:          0

      DTMF Interworking:          No

      Media Flowing:              Yes

      Unexpected SrcAddr Packets: No

      Billing ID:                 5788C7282020202038373038302B30363030303000EB2683

      Media directions allowed:   recvonly

      Max Burst size:             22000 (bytes)

      Delay variation tolerance:  0 (microseconds)

      SDP string:                 m=audio 0 RTP/AVP 8 96

   a=rtpmap:8 PCMA/8000/1

   a=rtpmap:96 telephone-event/8000/1

   a=fmtp:96 0-16

   a=ptime:20

      Graceful deactivation:      No

      DiffServ Code Point:        0x0

      IP TOS byte:                0x0

      Media Loss Event:           No

      NAT Latch Event:            No

    Side B:

      Name                       

      Reserved Bandwidth:         10500 (bytes/second)

      Status                      InService

      VRF Name:                   SBC-Internet

      VLAN Tags(Priorities):      0(0), 0(0)

      Local Address:              100.100.100.100

      Local Port:                 31198

      Remote Address:             200.200.200.200

      Remote Port:                10766

      Port Range Tag: <None>

      Packets Received:           111053

      Packets Sent:               142471

      Packets Discarded:          110886

      Data Received:              22210600 (bytes)

      Data Sent:                  28494200 (bytes)

      Data Discarded:             22177200 (bytes)

      GM Discarded Packets:       0

      Time To Recovery:           Not known

      EndPoint Packets Sent:          110829

      EndPoint Packets Received:      0

      EndPoint Packets Lost:          0

      DTMF Interworking:          No

      Media Flowing:              Yes

      Unexpected SrcAddr Packets: No

      Billing ID:                 5788C7282020202038373038302B30363030303000EB2684

      Media directions allowed:   sendrecv

      Max Burst size:             22000 (bytes)

      Delay variation tolerance:  0 (microseconds)

      SDP string:                 m=audio 0 RTP/AVP 8 96

a=rtpmap:8 PCMA/8000/1

a=rtpmap:96 telephone-event/8000/1

a=fmtp:96 0-16

a=ptime:20

      Graceful deactivation:      No

      DiffServ Code Point:        0x0

      IP TOS byte:                0x0

      Media Loss Event:           No

      NAT Latch Event:            No

Side B:

      Packets Received:           111053

      Packets Discarded:          110886

      111053 - 110886 = 167

Side A:

      Packets Sent:               167

Can anyone explain which packets can be discarded on CUBE (SP)? Which packages can be added into this statistic in packets discarded field? I found that it's "number of packets dropped (due to bandwidth policing, for example)" but we have no any bandwidth policies.

Can it be packets without the voice, for exampe noise or silence?

Thank you!

[Elvis Marques Alves Araujo]

Hi Evgeniy,

I can see the same problem in my enviromment. 

SBC Packets Received = 10002244641
SBC Octets Received = 6707956828454
SBC Packets Sent = 9799265961
SBC Octets Sent = 6664620614825
SBC Packets Discarded = 201747599
SBC Octets Discarded = 43277115523
No Media Count = 21918
Available Bandwidth For Transcoded Calls = Unlimited
Additional Transcoded Flows that Can Be Configured = Unlimited
Maximum Packet Rate For Transcoded Calls = Unlimited

Please, could you tell me if you found the cause for the discarded packets? I didn't find yet.

Thanks in advance