[cisco-voip] Comfort noise RTP

Fri Aug 9 15:20:39 EDT 2013

Is it possible for you to help with running configuration. If possible "
debug ccsip info " along with debug ccsip messages, Avoid running them in
peak hours.

That way we will be able to see, what caused CN generation.

On Thu, Aug 8, 2013 at 9:03 PM, Mark Holloway <mh at markholloway.com> wrote:

> This is incredibly odd.  I don't see a payload of 13 or an rtpmap with CN.
> Are you sure you have the entire frame included?  I would be curious to see
> a pcap SIP ladder diagram of the call flow. That SDP is huge. I wouldn't be
> surprised if something in that SDP is triggering the abnormal behavior. :)
>
> On Aug 8, 2013, at 6:33 AM, Seth McGuinness <
> Seth.McGuinness at imaginegroup.ie> wrote:
>
> ** ** **
>
> Hello All, ****
>
> ** **
>
> We have a customer complaining about Comfort Noise generating from our
> Cisco AS5400, strange thing is that the packet traces suggest that the
> request for comfort noise generation comes from the client SIP invite, I
> can’t see where this is the case in the invite.****
>
> ** **
>
> Client invite ****
>
> ** **
>
> No.     Time                  Source     Destination Protocol Length Info*
> ***
>
> 1 2013-08-07 09:21:34.500695  10.10.1.1  192.168.1.1 SIP/SDP  1131
> Request: INVITE sip:+197831111111149 at 192.168.1.1;user=phone, with session
> description****
>
> ** **
>
> Frame 1: 1131 bytes on wire (9048 bits), 1131 bytes captured (9048 bits)**
> **
>
> Ethernet II, Src: WwPcbaTe_11:11:11 (00:0f:1f:11:11:11), Dst:
> BrocadeC_22:22:22 (00:1b:ed:22:22:22)****
>
> Internet Protocol Version 4, Src: 10.10.1.1(10.10.1.1), Dst: 192.168.1.1
> (192.168.1.1)****
>
> User Datagram Protocol, **Src** **Port**: sip-tls (5061), ****Dst** **Port
> ****: sip (5060)****
>
> Session Initiation Protocol****
>
>     Request-Line: INVITE sip:+197831111111149 at 192.168.1.1;user=phoneSIP/2.0
> ****
>
>     Message Header****
>
>     Message Body****
>
>         Session Description Protocol****
>
>             Session Description Protocol Version (v): 0****
>
>             Owner/Creator, Session Id (o): - 1375863694 1375863694 IN IP4
> 10.10.1.1****
>
>                 Owner Username: -****
>
>                 Session ID: 1375863694****
>
>                 Session Version: 1375863694****
>
>                 Owner Network Type: IN****
>
>                 Owner Address Type: IP4****
>
>                 Owner Address: 10.10.1.1****
>
>             Session Name (s): -****
>
>             Connection Information (c): IN IP4 10.10.1.1****
>
>                 Connection Network Type: IN****
>
>                 Connection Address Type: IP4****
>
>                 Connection Address: 10.10.1.1****
>
>             Time Description, active time (t): 0 0****
>
>                 Session Start Time: 0****
>
>                 Session Stop Time: 0****
>
>             Media Description, name and address (m): audio 33870 RTP/AVP 8
> 0 18 101****
>
>                 Media Type: audio****
>
>                 ****Media** **Port****: 33870****
>
>                 Media Protocol: RTP/AVP****
>
>                 Media Format: ITU-T G.711 PCMA****
>
>                 Media Format: ITU-T G.711 PCMU****
>
>                 Media Format: ITU-T G.729****
>
>                 Media Format: DynamicRTP-Type-101****
>
>             Media Attribute (a): rtpmap:8 PCMA/8000****
>
>                 Media Attribute Fieldname: rtpmap****
>
>                 Media Format: 8****
>
>                 MIME Type: PCMA****
>
>                 Sample Rate: 8000****
>
>             Media Attribute (a): rtpmap:0 PCMU/8000****
>
>                 Media Attribute Fieldname: rtpmap****
>
>                 Media Format: 0****
>
>                 MIME Type: PCMU****
>
>                 Sample Rate: 8000****
>
>             Media Attribute (a): rtpmap:18 G729/8000****
>
>                 Media Attribute Fieldname: rtpmap****
>
>                 Media Format: 18****
>
>                 MIME Type: G729****
>
>                 Sample Rate: 8000****
>
>             Media Attribute (a): fmtp:18 annexb=no****
>
>                 Media Attribute Fieldname: fmtp****
>
>                 Media Format: 18 [G729]****
>
>                 Media format specific parameters: annexb=no****
>
>             Media Attribute (a): rtpmap:101 telephone-event/8000****
>
>                 Media Attribute Fieldname: rtpmap****
>
>                 Media Format: 101****
>
>                 MIME Type: telephone-event****
>
>                 Sample Rate: 8000****
>
>             Media Attribute (a): fmtp:101 0-15****
>
>                 Media Attribute Fieldname: fmtp****
>
>                 Media Format: 101 [telephone-event]****
>
>                 Media format specific parameters: 0-15****
>
>             Media Attribute (a): sendrecv****
>
>             Media Attribute (a): silenceSupp:off - - - -****
>
>                 Media Attribute Fieldname: silenceSupp****
>
>                 Media Attribute Value: off - - - -****
>
> ** **
>
> ** **
>
> Our response****
>
> ** **
>
> No.     Time                       Source         Destination
> Protocol Length Info****
>
> 2       2013-08-07 09:21:41.862610 192.168.1.1    10.10.1.1
>      RTP      60     PT=Comfort noise, SSRC=0x8FED3F6, Seq=28259,
> Time=1374861414 ****
>
> ** **
>
> Frame 7: 60 bytes on wire (480 bits), 60 bytes captured (480 bits)****
>
> Ethernet II, Src: BrocadeC_22:22:22 (00:1b:ed:22:22:22), Dst:
> WwPcbaTe_11:11:11 (00:0f:1f:11:11:11)****
>
> Internet Protocol Version 4, Src: 192.168.1.1 (192.168.1.1), Dst:
> 10.10.1.1(10.10.1.1)****
>
> User Datagram Protocol, **Src** **Port**: 19578 (19578), ****Dst** **Port*
> ***: 33870 (33870)****
>
> Real-Time Transport Protocol****
>
>     [Stream setup by SDP (frame 1)]****
>
>     10.. .... = Version: RFC 1889 Version (2)****
>
>     ..0. .... = Padding: False****
>
>     ...0 .... = Extension: False****
>
>     .... 0000 = Contributing source identifiers count: 0****
>
>     0... .... = Marker: False****
>
>     Payload type: Comfort noise (13)****
>
>     Sequence number: 28259****
>
>     [Extended sequence number: 93795]****
>
>     Timestamp: 1374861414****
>
>     Synchronization Source identifier: 0x08fed3f6 (150918134)****
>
>     Payload: 48****
>
> ** **
>
> In our RTP Comfort noise payload type 13 in frame(2) it states that the
> Stream has been setup by SDP in frame 1, I can’t see this in frame 1, it
> has silence suppression turned off and annexb=no, the RTP stream is G.711
> anyway, I left out the whole capture for brevity. Has anyone come across
> this? Any suggestions appreciated and apologies if I post this in the wrong
> place!****
>
> ** **
>
> Cheers ****
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> ******
>
>
>
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