[asterisk-bugs] [JIRA] (ASTERISK-21151) "Squelching" early media in DAHDI (sig_pri)

[Gianluca Merlo (JIRA)]

Gianluca Merlo created ASTERISK-21151:
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             Summary: "Squelching" early media in DAHDI (sig_pri)
                 Key: ASTERISK-21151
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21151
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_dahdi
    Affects Versions: 1.8.19.1
            Reporter: Gianluca Merlo


I am creating this issue following the suggestion made by Richard Mudgett in the asterisk-dev mailing list:

http://lists.digium.com/pipermail/asterisk-dev/2013-February/058764.html

The issue itself, in 1.8.19.1, is that DAHDI starts returning voice frames as soon as a CALL PROCEEDING indication is received on PRI, even in the absence of a "progress indicator" suggesting the availability of inband progress information.

As Mr. Mudgett said, channels/sig_pri.c contains an improvable call to sig_pri_set_dialing() in the handling of PRI_EVENT_PROCEEDING, which could be made (eventually by a chand_dahdi configuration option) to both restore "strict" compatibility with Q.931 and accomodate broken peers such as the one in ASTERISK-17834.

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