[asterisk-bugs] [JIRA] (ASTERISK-25858) Early media not processed when received ACM with some conditions

[Igor Nikolaev (JIRA)]

Igor Nikolaev created ASTERISK-25858:
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             Summary: Early media not processed when received ACM with some conditions
                 Key: ASTERISK-25858
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25858
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_dahdi/SS7
    Affects Versions: 13.7.2, 13.7.1, 13.7.0, 13.6.0, 13.5.0, 13.4.0, 13.3.2, 13.3.1, 13.3.0, 13.2.1, 13.2.0, 13.1.1, 13.1.0, 13.0.2, 13.0.1, 13.0.0
         Environment: SS7 digital trunk environment
            Reporter: Igor Nikolaev


If we making outbound call via SS7 and after sending ISUP IAM we got ACM with following conditions:
Backward call indicators contain called party's status indicator "no indication" (i.e. == 0);
Optional backward call indicators contain in-band information indicator (i.e. == 0x01);

we can do a PROGRESS SIP message and start early media channel.

Required procedure described at the ETSI ES 283 027 V1.4.0 (2007-09) in section 7.2.3.1.4a Sending of 183 Session Progress for early media scenarios.




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