[asterisk-bugs] [JIRA] (ASTERISK-26596) Placing call on hold temporarily locks up set

[Igor Goncharovsky (JIRA)]

Igor Goncharovsky created ASTERISK-26596:
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             Summary: Placing call on hold temporarily locks up set
                 Key: ASTERISK-26596
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26596
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_unistim
    Affects Versions: 11.24.1, 13.12.1, 14.1.1
         Environment: Debian Linux x86 Intel, Debian Linux ARMh/ARMl
            Reporter: Igor Goncharovsky
            Assignee: Igor Goncharovsky
         Attachments: ASTERISK-26565-v1.diff

With a Nortel i2002 (also tested on unknown i2001) places or receives a call, and an audio path is brought up (as in, audio is transmitted and/or received from an application or another channel), eg: a call is established, pressing the hold button properly sets up a bridge of MOH to the other side (they hear music), a caller in this example. At this point, the Nortel set is locked. Icons indicate a call is on hold, but no further buttons effect any function. Looking at debug messages, when the switchhook is pressed, even repeatedly, a message is generated on every press: 
"WARNING[2075] chan_unistim.c: Close call without sub"
Interestingly, when the other end of the call hangs-up, the icon on the Nortel set indicates such, but remains locked. The UDP/RTP ports are still held at this point. But, placing a call to the same locked-up set, from any functioning channel, unlocks the set, and CLID etc are there, and ringing away. Answering the call, (on the Nortel set) it's all back to normal, and after parties hang up, both/all UDP/RTP ports are properly released. 
(Note: ports being released is dependent on the patch from ASTERISK-26561 which fixed this on 7 November, 2016.) This is repeatable on three Nortel sets, acoss releases. 



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