[asterisk-bugs] [JIRA] (ASTERISK-21705) use of rtpkeepalive results in empty RTP packets with a marker bit set, plus a ULAW payload instead of CN

[Rusty Newton (JIRA)]

Rusty Newton created ASTERISK-21705:
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             Summary: use of rtpkeepalive results in empty RTP packets with a marker bit set, plus a ULAW payload instead of CN
                 Key: ASTERISK-21705
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21705
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General, Resources/res_rtp_asterisk
    Affects Versions: 1.8.17.0, 1.8.18.0, 1.8.19.0, 1.8.20.1
         Environment: ubuntu 10.04
            Reporter: Peter Katzmann


See attached traces
During call asterisk switches the negotiated codec (alaw) in the rtp to ulaw.
If there is no renegotiation (like on my snom 720 sometimes), the user has a audible distortion.

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