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

Jonathan Rose jrose at digium.com
Mon Nov 4 17:39:59 CST 2013

On Mon, Nov 4, 2013 at 2:04 PM, Mert Yazgart <efes9999 at hotmail.com> wrote:

> I'm relatively new to Asterisk, and not familiar with the inner workings
> of the code. It was recommended that I post here (instead of the users
> list) - I appreciate it if a developer with experience with Asterisk
> parking can shed some light on the issue I'm having.
> I'm basically letting Asterisk (1.8.23) handle all of the parking process:
> features.conf
> parkext => 700
> parkpos => 701-702
> context => parkedcalls
> On the Cisco phone, I programmed one of the soft keys to park the calls:
> Key: fnc=sd;ext=700 at;vid=1;nme=Park
> I can either press this key or dial #700 to park the call. Both work
> smoothly.
> The problem happens when I try to park a call when the parking lot is full:
> - if I try to park it with dialing #700,I get a warning message saying
> that it can't be done. The existing call (that I tried to park) stays on as
> intended. This is the desired behavior.
> - On the other hand, if I try to park it via using the Key (which sends a
> REFER), Asterisk responds with a SIP 503 message (which the phone processes
> correctly telling me that its an invalid transfer). However, the existing
> call is gone - both caller and callee's phones show as if there is a call,
> but they are not connected to each other.  There is no SIP BYE. Asterisk
> CLI says :
> Spawn extension (callee) exited non-zero on 'Parking\SIP\caller'...
> Is there something that can be done not to lose the call?
> I noticed that parking with dialing #700 and parking with the key button
> seem to be handled differently in the Asterisk code with different results
> in this case:
> #700 goes thru xfer_park_call_helper and eventually masq_call_transfer in
> features.c.
> Key method (REFER) goes thru sip_park_thread in chan_sip.c,
> ast_park_call_exten and park_call_full in features.c.
> Thanks,
> Mert
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Out of morbid curiosity, could you test the same type of transfer against
Asterisk 12's parking system?

Also, is this a blind or attended transfer? As in, does the person
transferring the call hear the parking failed message, and does that person
then get hung up on, or is it the transferee the one that actually
attempted parking and failed?

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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