PickUpChan exit asterisk

Hi! I’m using asterisk 1.8.4.2
When Sometimes when I excecute the app PickupChan() from the dial plan, the call is dropped and exit me out from the CLI.

See the CLI output.

== Using SIP RTP CoS mark 5
– Executing [76@plan-avanzado:1] Goto(“SIP/202-0000000a”, “directpickup,s,1”) in new stack
– Goto (directpickup,s,1)
– Executing [s@directpickup:1] Answer(“SIP/202-0000000a”, “”) in new stack
– Executing [s@directpickup:2] Set(“SIP/202-0000000a”, “AUDIOHOOK_INHERIT(MixMonitor)=yes”) in new stack
– Executing [s@directpickup:3] Set(“SIP/202-0000000a”, “__DYNAMIC_FEATURES=F1#F2#F3#F4#F5#F6”) in new stack
– Executing [s@directpickup:4] DISA(“SIP/202-0000000a”, “no-password,directpickup”) in new stack
– Executing [201@directpickup:1] Answer(“SIP/202-0000000a”, “”) in new stack
– Executing [201@directpickup:2] PickupChan(“SIP/202-0000000a”, “SIP/201”) in new stack
– Executing [201@directpickup:3] Congestion(“SIP/202-0000000a”, “5”) in new stack
– SIP/202-0000000a answered SIP/204-00000006
Linux*CLI>
Disconnected from Asterisk server
[root@Linux asterisk]#

wiki.asterisk.org/wiki/display/ … +Backtrace

This only happen sometimes.
Sometimes I pickup the call great, sometimes NO.

But it doesn’t display anything anormal in the CLI.