[asterisk-bugs] [JIRA] (ASTERISK-20650) Asterisk does not respect ptime

[Matt Jordan (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-20650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=199449#comment-199449 ] 

Matt Jordan commented on ASTERISK-20650:
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I don't see any RTP packetization set on any of the peers in your config, which is okay, but that does mean that the packetization will comes soley from the SIP traffic (which is probably what you want anyway).  However, by default {{autoframing}} is False and I don't see it in your config.  This probably needs to be set to True for Asterisk to properly use the ptime attributes passed in the SDP (from https://wiki.asterisk.org/wiki/display/AST/RTP+Packetization):

{quote}
In sip.conf if autoframing=yes is set in the global section, then all calls will try to set the packetization based on the remote endpoint's preferences. This behaviour depends on the endpoints ability to present the desired packetization (ptime\:) in the SDP. If the endpoint does not include a ptime attribute, the call will be established with 20ms packetization.
{quote}

Can you try setting autoframing to yes and see what happens?
                
> Asterisk does not respect ptime
> -------------------------------
>
>                 Key: ASTERISK-20650
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20650
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/General, Resources/res_fax
>    Affects Versions: 1.8.17.0
>            Reporter: Maciej Krajewski
>            Assignee: Maciej Krajewski
>            Severity: Critical
>         Attachments: ast_config.zip, tmptk_20121102_1527_g02_editcap.cap, tmptk_20121105_1155_g03_edit_filtr.cap
>
>
> Today I have found a problem concerning asterisk 1.8.X
> I've migrated one of my servers from old version of asterisk 1.4 branch to the newest 1.8.
> Everything works fine, but faxes has stopped working.
> I've made some research and what I have found is that asterisk 1.8 has some problems with transcoding ptime, it simply does not do this, Astersik 1.4 was coping with this.
> I've attached the cap file where one of my legs is negotiating connection with ptime 10, the other one with ptime 20.
> However if you look at the payload of RTP packets it is 10 ms every where.

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