[asterisk-bugs] [JIRA] (ASTERISK-22814) GROUP broken for attended transfer (Both SIP transfer and features.conf)

[Matt King, M.A. Oxon. (JIRA)]

Matt King, M.A. Oxon. created ASTERISK-22814:
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             Summary: GROUP broken for attended transfer (Both SIP transfer and features.conf)
                 Key: ASTERISK-22814
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22814
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Functions/func_groupcount
    Affects Versions: 11.6.0, 1.8.15.0
         Environment: Debian linux, SIP.
            Reporter: Matt King, M.A. Oxon.


A common use for call centres is to restrict phones to give busy tone if one line is busy on a phone and a further incoming call is placed, while leaving a second line free for outbound calls and attended transfers.  This ensures that the queue will move swiftly on to other agents if the phone is already in use, which is highly desirable.

The recommended way to handle this in the dialplan is by using the GROUP and GROUPCOUNT functions.

However, problems arise when an attended transfer is made, using EITHER SIP attended transfer direct from the phone, OR the mechanism specified in features.conf

Specifically, the Group is NOT cleared when the original phone drops out of the call at the end of the transfer.  Instead, the Group is only cleared when the final party hangs up.

This leaves the agent unable to take further calls until the transferred call completes.

See below for steps to reproduce.

This problem has been found with SIP phones. It is unknown whether other channel types are affected, however this seems highly probable as the Group function is channel type agnostic.

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