[asterisk-dev] Call is lost when Parking lot is full

Jonathan Rose jrose at digium.com
Thu Nov 7 12:30:34 CST 2013

On Mon, Nov 4, 2013 at 6:50 PM, Matt Hamilton <mistral9999 at hotmail.com>wrote:

> > Out of morbid curiosity, could you test the same type of transfer
> against Asterisk 12's parking system?
> I can do that in the next couple of days and let you know.
> > Also, is this a blind or attended transfer?
> There is no parking failed message, Asterisk only sends SIP 503.
> In sip_park function in chan_sip.c, it seems like the original transferer
> and transferee channels are masqueraded, the sip_park_thread is run, but
> the parking fails because the parking lot is full.  Can it be because of
> this masquerading that Asterisk cannot restore the original call? I hope
> I'm making sense...
> Thanks,
> Mert

Well, under normal circumstances, I think one of two things would happen
when using the transfers feature from a SIP phone...

Blind transfer (where the device will hang up as soon as you push transfer)
- The parking would fail, the transferee would have nowhere to go, and then
the channel would get terminated because it isn't connected to anyone

Attended transfer (the device dials the extension, listens for a while, and
then completes the transfer) - Parking would fail. If the transfer button
is pushed while the parked call failure message would play, the call is
effectively over after the transferee finishes hearing the parked call
failure message.

Either way, both channels should eventually get hung up. Throw me some
sample configs (just the relevant parking lots in features.conf and any
extensions from extensions.conf you may be using) and I'll take a peek.
Jonathan R. Rose
Digium, Inc. | Software Engineer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
direct +1 256 428 6139

Check us out at: http://digium.com & http://asterisk.org
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