HI I was fix the problem but using dirty method.
I was add in my incoming context on section dial "g". (*g*: When the called party hangs up, continue to execute commands in the current context at the next priority. )
And now B can hangup. But I think is still a bug. Below my capture from mtpd3 debug. http://www.cloudshark.org/captures/ab6193132760 Regards Grzegorz Maciak
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