[asterisk-bugs] [JIRA] (ASTERISK-21170) DTMF timestamp issue

[Jonathan Rose (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-21170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=211035#comment-211035 ] 

Jonathan Rose edited comment on ASTERISK-21170 at 10/18/13 10:27 AM:
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Hey Nitesh, I've been poking at this patch a bit, and I don't see anything wrong with it so far. I do have a question though with regards to one line:

	rtp->lastts += calc_txstamp(rtp, NULL) * 8;

What is the reason for multiplying by eight here and in all the other new places calc_txstamp is called exactly? Is the unit of time we are working with in eight increments of the return from calc_txstamp or what?
                
      was (Author: jrose):
    Hey Nitesh, I've been poking at this patch a bit, and I don't see anything wrong with it so far. I do have a question though with regards to one line:

	rtp->lastts += calc_txstamp(rtp, NULL) * 8;

What is the reason for multiplying by eight here exactly? Is the unit of time we are working with in eight increments of the return from calc_txstamp or what?
                  
> DTMF timestamp issue
> --------------------
>
>                 Key: ASTERISK-21170
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21170
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_rtp_asterisk
>    Affects Versions: SVN
>         Environment: x86_64 Debian Squeeze
>            Reporter: NITESH BANSAL
>            Assignee: Jonathan Rose
>         Attachments: DTMF-TIME-STAMP-ISSUE.tar.gz, dtmf-timestamp.patch
>
>
> Asterisk assumes that every RTP packet is 20 ms apart which does not work for the start and stop of DTMF and it causes issues for the equipment which tries to render the RTPEvent DTMF back into Inband.
> High jitter values have been observed for the DTMF packets.

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