[asterisk-bugs] [JIRA] (ASTERISK-20746) Asterisk resets ptime value in 200 OK response

[Matt Jordan (JIRA)]

Matt Jordan created ASTERISK-20746:
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             Summary: Asterisk resets ptime value in 200 OK response
                 Key: ASTERISK-20746
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20746
             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


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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