[jitsi-issues] [JIRA] Created: (JITSI-1099) Screetching sound when RTP sequence numbers wrap with SRTP with asterisk

stephane.chazelas (JIRA) jira-no-reply at java.net
Sat Jan 19 18:33:53 CET 2013

Screetching sound when RTP sequence numbers wrap with SRTP with asterisk

                 Key: JITSI-1099
                 URL: http://java.net/jira/browse/JITSI-1099
             Project: jitsi
          Issue Type: Bug
    Affects Versions: future
         Environment: reproduced with debian testing amd64 with jitsi 1.1.4405.10286
            Reporter: stephane.chazelas
            Priority: Minor

It's a follow up on the issue discussed at http://markmail.org/message/vi4kbpy6w4w7f4bd whereby one media channel became silent after the RTP sequence number wrapped when doing a call with SRTP (SDES) with asterisk.

That issue has been fixed (in revision 10236), however, there remains a minor issue whereby, at least when using the PCMA, PCMU or g722 codecs (but not GSM or speex), we hear a short screeching noise when the sequence number wraps. Something we can perfectly live with but probably indicates an underlying bug. At the same time of that screeching noise, we see in jitsi's logs:

INFO: net.sf.fmj.media.Log.info() Resetting queue, last seq added:
65535, current seq: 0 

The mode operandi to reproduce is the same as in the discussion mentioned above (instructions can be found there).

During an echo test, we hear the screeching noise when the sequence number for the media channel *we* send wraps (note that we hear it on the channel that comes back from the echo, so it's also possible that asterisk be to blame or at least is part of the problem. However, we don't hear a similar screeching with other phones like the SNOM 300 phone).

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