What version of FreeSWITCH are you running?
-MC
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Yes, you can export it, "nolocal" to activate only on the B leg, e.g.:

<action application="export" data="nolocal:api_hangup_hook=lua file.lua"/>

Or.. set the variable in the bridge string.

-Avi
It works! Thanks a lot. Now I have a small problem, the channels seem
to be destroyed or unaccessible when the hangup hook is executed. I
tested a dialplan with the following line:

<action application="set" data="session_in_hangup_hook=true"/>
<action application="export" data="api_hangup_hook=uuid_exists ${uuid}"/>

And the FS log reports that none of the legs exists:

2011-08-03 19:01:30.609887 [DEBUG] switch_core_state_machine.c:492
Hangup Command with no Session
uuid_exists(2bd2ce25-99fe-41fe-bcfe-d8224a9d6f18):
false
[...]
2011-08-03 19:01:30.645615 [DEBUG] switch_core_state_machine.c:492
Hangup Command with Session
uuid_exists(2bd2ce25-99fe-41fe-bcfe-d8224a9d6f18):
false

This shows that the export works, as the hook is executed twice.
Although the ${uuid} is expanded only once. But it's curious as the
channel uuid where the hook is beign executed has not been destroyed
yet.

Cheers.
I'm not sure exactly what you are trying to do, but yes, the ${uuid}
is expanded at the time of the "hunt" in the dialplan, before the
second leg was even created.
-Avi Marcus
My original intention was to set a channel variable from the
api_hangup_hook:

<action application="export" data="nolocal:api_hangup_hook=uuid_setvar
${uuid} fooooo baaaaar"/>

But as the expanded ${uuid} does not exist, the uuid_setvar command
complains.

Cheers.
If the channel is hung up, then it's hung up.. that's what the hangup
hook is, afaik.
If you look at the wiki page for this:
http://wiki.freeswitch.org/wiki/Variable_session_in_hangup_hook
it only says that you can "access" the variable, not that the channel
still exists or that you can set them.
Why do you need to use a hangup hook to set a variable? can't you set
it at the start? Or import B leg into A leg's CDRs?

-Avi Marcus

718-989-9485 (USA)
054-844-3271 (Israel Kosher)
077-228-5055 (Israel Landline)
020-3519-3606?(UK)
It looks that the session object is only available through bindings like
mod_lua. I'll have to check
It's a bit tricker than that. We are trying to implement a stateless
CDR processing and billing mechanism that works also across call
transfers.

As I said, we will probably end up defining a Lua hook.

Thanks again for your quick response.

Cheers.
Just remember that once the call ends, the "session" object you have is
read-only. You can still do interesting things, but you cannot alter CDRs
after the call ends, at least not in a session hangup hook. You are better
off with XML CDRs and post-call logic. With all of the screwy transfer
scenarios you have to account for you will absolutely need to do some
post-processing logic. Sounds like lots of "fun". :P

-MC
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Good to know.
These days we are trying to modify other channels variables from the
hangup hook (channels like the ones involved in whatever kind of
transfer).
Fun indeed. Our ideal target would be to have each CDR self-contained.
In general, we only want to bill the A-leg CDRs as they are the
originators. However, some B-leg CDRs need to be billed if they were
created by a transfer and some A-leg CDRs can be discarded if they
participated in an attended transfer.

As you rightfully mentioned, when transfers are chained is where the
obscure scenarios arise.

If our experiments provide a working proof of concept, we have two
choices left:

1. Subscribe to CHANNEL_STATE events in order to catch transfer
directly from event socket. But we would be mixing mod_xml_cdr,
mod_xml_curl and event socket altogether, so we want to avoid
that.

2. Forget about stateless CDRs and pray (or inspect the source code)
for mod_xml_cdr generating originator CDRs last, always.

If anybody is interested, I can keep him/her informed.

Cheers.
One other thing you might want to do is look at the callflows at the end of
each xml cdr. they paint a picture of "what really happened" on the call and
might give you the information that you need.
-MC
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Ok. I still have some problems with this. My dialplan contains the
following:

<action application="export" data="session_in_hangup_hook=true"/>
<action application="export" data="api_hangup_hook=luarun
transfer_check.lua ${uuid}"/>

The transfer_check.lua script is the following:

session = freeswitch.Session(argv[1])
local cause = session:hangupCause()

if cause == "ATTENDED_TRANSFER" or cause == "BLIND_TRANSFER"
then
api = freeswitch.API()
api.execute("log", "NOTICE Transfer detected, billsec is " ..
session:getVariable("billsec"))
end

The problem is that, as already discussed, the channel no longer exists
so the UUID is not referring to anything.

Basically, my question is: How do you obtain the session object in a
hangup hook?

Cheers.
Is this any use?

http://wiki.freeswitch.org/wiki/Mod_lua#Special_Case:_env_object

-Steve
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To help connect the dots I added some links to/from that Lua wiki page and
channel_in_hangup_hook and also api_hangup_hook and reporting_hangup_hook.

-MC
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Sorry, typo: that was supposed to be "api_reporting_hook" which I need to
document anyway. ;)
-MC
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That "channel_in_hangup_hook" sounds promising to me, although I can't
find any mention of it in the wiki:

http://wiki.freeswitch.org/wiki/Special:Search?search=channel_in_hangup_hook&go=Go

Regards.
That's what I get for trying to do too much all at once. The correct chan
var name is:
session_in_hangup_hook

Sorry...
-MC
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Heh, I was washing de dishes and I just realized you were meaning that.
And I was going to write an apology too.

Cheers and thanks for all.
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