[Freeswitch-users] Question about Lua script: How do I detect when someone picks up the phone?

[Nicolas Brenner]

On Wed, Jan 20, 2010 at 7:06 PM, Mike van Lammeren <mike at van.lammeren.net>wrote:

> So, I've been reading about early media in the wiki, and have made a little
> progress, which leads to more questions.
>
> I understand now why a call is considered connected before one person has
> picked up the phone. I am also able to get my script to wait for the phone
> to be picked up, by setting the ignore_early_media variable when starting a
> new session, like this:
>
> customerSession =
> freeswitch.Session("{ignore_early_media=true}sofia/gateway/example.com/"
> .. customerPhoneNumber)
>
>
> After that line, the script waits for the other phone to be picked up.
>
> However, now I wonder what to do with calls that don't complete, get busy
> signals, etc.
>
> What do people do in this case? The only related example I can find on the
> web is for a javascript dialer, which doesn't address any of these cases.
>


I guess it depends on what you want to do. For example I have a lua script
very similar to what you describe, although there is no confirmation
involved. Depending on the hangup cause the session gets, it might try
redialing with a different gateway, try again or just hangup.

Take a look here http://wiki.freeswitch.org/wiki/Hangup_causes to see what
each hangup cause means. You don't need to have a special case for all of
them, only the ones you are interested in.

Here's an example in code which retries a call depending on the hangup
cause. It retries max_retries1 times and alternates between 2 different
gateways:

session1 = null;
max_retries1 = 3;
retries = 0;
ostr = "";
repeat
        retries = retries + 1;
        if (retries % 2) then ostr = originate_str1;
        else ostr = originate_str12; end
        freeswitch.consoleLog("notice", "*********** Dialing Leg1: " .. ostr
.. " - Try: "..retries.." ***********\n");
        session1 = freeswitch.Session(ostr);
        local hcause = session1:hangupCause();
        freeswitch.consoleLog("notice", "*********** Leg1: " .. hcause .. "
- Try: "..retries.." ***********\n");
until not ((hcause == 'NO_ROUTE_DESTINATION' or hcause ==
'RECOVERY_ON_TIMER_EXPIRE' or hcause == 'INCOMPATIBLE_DESTINATION' or hcause
== 'CALL_REJECTED' or hcause == 'NORMAL_TEMPORARY_FAILURE') and (retries <
max_retriesl1))


Note: originate_str1 and originate_str2 are two different dial strings for 2
different gateways.



>
> Early Media: http://wiki.freeswitch.org/wiki/Early_media
> ignore_early_media variable:
> http://wiki.freeswitch.org/wiki/Variable_ignore_early_media
> <http://wiki.freeswitch.org/wiki/Variable_ignore_early_media>javascript
> dialer: http://alexn.org/docs/dialer.html
>
>
> <http://alexn.org/docs/dialer.html>Mike van Lammeren
>
>
> On Wed, Jan 20, 2010 at 4:45 PM, Mike van Lammeren <mike at van.lammeren.net>wrote:
>
>> Hi Rob!
>>
>> Unfortunately, I have the next few weeks to complete this part of the
>> project. Without a stable release of 1.0.5, I have to stick with 1.0.4. I'm
>> sure that 1.0.4 can detect and report when a phone is picked up. It's just
>> that I can't figure out how to get that information! Either that, or I have
>> something mis-configured.
>>
>> Mike van Lammeren
>>
>>
>> On Wed, Jan 20, 2010 at 4:32 PM, Rob Forman <rob4manhere at gmail.com>wrote:
>>
>>> Hi Mike,
>>>
>>> I don't think v1.0.4 is supported any longer.   You'll have better luck
>>> getting assistance by upgrading to trunk or the latest tar and reporting
>>> back.
>>>
>>> Good luck!
>>> Rob
>>>
>>> On Wed, Jan 20, 2010 at 3:18 PM, Mike van Lammeren <
>>> mike at van.lammeren.net> wrote:
>>>
>>>>  Hello!
>>>>
>>>> Some day, I'll probably laugh at asking this question, but today I can't
>>>> figure it out.
>>>>
>>>> I've written a Lua script that listens for a call, then dials a phone
>>>> number to a second person. It plays a message, then prompts the second
>>>> person to hit pound to connect. If the second person hits pound, then it
>>>> bridges the two calls together.
>>>>
>>>> All that works great, but I can't figure out how to get the session for
>>>> the second person to wait until that person answers.
>>>>
>>>> I'm using FreeSWITCH 1.0.4, and although there is a *getState* function
>>>> documented in the wiki, it doesn't seem to exist for me.
>>>>
>>>> Any help would be appreciated!
>>>>
>>>>
>>>> Mike van Lammeren
>>>>
>>>>
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>>>
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>>
>
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