[asterisk-bugs] [JIRA] (ASTERISK-21399) RTP Multicast of L16 (type 10): Asterisk and wireshark disagree

[Tzafrir Cohen (JIRA)]

Tzafrir Cohen created ASTERISK-21399:
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             Summary: RTP Multicast of L16 (type 10): Asterisk and wireshark disagree
                 Key: ASTERISK-21399
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21399
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/General
    Affects Versions: SVN
         Environment: Debian 7.0, wireshark 1.8.2-5wheezy2
            Reporter: Tzafrir Cohen
            Severity: Minor


While trying to debug an RTP multicast issue, I tried to use the following in the Asterisk CLI to send an RTP multicast to the phone:

originate MulticastRTP/basic/224.0.0.5:5000 application Playback long-test-file

(The MoH could be used for <long-test-file>)

The phone (Yealink SIP-T28P) reports that it was sent "HD", and and does not produce any useful sound, apart from low-volume noise.

In order to reproduce the problem I recorded the sound using:

  tcpdump -w rtp.cap -s0 'host 224.0.0.5'

After a while I stopped the multicast channel using 'channel request hangup' and ended the recording. rtp.cap is attached.

In wireshark:

1. Select Analyze -> Decode as -> RTP

You will note that all packets now are parsed as having "Payload type: 16-bit uncompressed audio, stereo (10)".

2. Telephony -> RTP -> Stream Analysis
3. Try playing the audio in the player. Nothing heard.
4. Save Payload. Save it as 'rtp.sln' and 'play' will play it just fine, so Asterisk did not do anything to the content.



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