[Freeswitch-users] Early Media AMD

Wed Sep 17 11:24:50 MSD 2014

Dear Michael,

I thank you for the support.

I just curious to is it doable with Freeswitch, other way I have to start
to digging Asterisk module development documents.

It seems this way was more quick than other.

My Humble Regards.

2014-09-17 2:21 GMT+03:00 Michael Collins <msc at freeswitch.org>:

>
>
> On Tue, Sep 16, 2014 at 12:28 PM, Delifisek Tux <delifisek.tux at gmail.com>
> wrote:
>
>> Hello Thanks for answers.
>>
>> English was not my first language. I believe there where errors in my
>> question. I'll try to explain my self, please have patience for my mistakes.
>>
> No worries!
>
>
>>
>> Also, when I start to dig deep, I found my VOIP knowladge was very
>> shallow. Configuring asterisk from console looks great for me. However
>> today I found I cannot debug meaningfully sip protocol, which is
>> frusturates me.
>>
> Don't worry, SIP frustrates everyone. :)
>
>
>>
>> Anyway,
>>
>> In my scenario,
>>
>> There is no user on my setup. I had autodialer to call numbers. My
>> provider has new voice mail box rule for unanswered, busy and unreached
>> numbers, If I leave message it cost me a time and a very expensive service
>> fee. This was increase my costs.
>>
>> So I setup a dial timeout. However, if too short phone answer ratio was
>> drop significantly, If too long then I leave a message.
>>
>>
>> So I want to check is there an early media voice. If there is a voice
>> (not ringing) I want to hangup line. I cannot do this with asterisk. Even I
>> try to hack it and code is so large for short time learning.
>>
>> The another problem is. We are use GSM gateways so %100 percent SIP was
>> not available.
>>
>> From my point of view I have to develop a solution which can listen early
>> media and if there is a voice. Hangup the line.
>>
>> Is this doable with base Freeswitch ?
>>
> Possibly. One technique would be to listen for ringing in early media, and
> if you don't hear ringing then assume it's the message machine and hangup.
> It's a long shot but you might be able to use the tone_detect app to
> transfer the call leg to an extension that does your call processing. If
> the tone_detect doesn't hear ringing then you could just hangup after a
> certain amount of time. (Start here
> <https://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_tone_detect>.)
>
> If you really want to detect the message then you'd need mod_com_amd in
> order to do this. If mod_com_amd works like the old mod_amd then you can do
> detection in early media. It might be tricky and it won't be 100% but it
> would probably work for many calls.
>
> This is not an easy thing to do so be patient and try different methods.
>
> -MC
>
>
>
>> My Best Regards
>>
>> 2014-09-16 20:30 GMT+03:00 Michael Collins <msc at freeswitch.org>:
>>
>>> This is the proverbial auto dialing chicken-and-egg scenario. There's a
>>> love-hate relationship with early media. Sometimes the early media is handy
>>> and sometimes it's annoying. Figuring out which is which can be a challenge.
>>>
>>> Before you go down the path of AMD (which requires an investment of both
>>> time and money) I'd assess the situation and find out if you can indeed
>>> ignore all early media, or if you want to do the semi-magical trick of
>>> monitoring early media and selectively ignoring or passing it. Start here:
>>> https://wiki.freeswitch.org/wiki/Variable_monitor_early_media_ring
>>>
>>> If you think that all early media is bad except for ringing then that
>>> may just do the trick. Just keep in mind that no solution that tries to
>>> examine audio like this will ever be 100% accurate. Still if you can get
>>> yourself to 90% or more accurate then you're doing well, especially given
>>> the price tag of FreeSWITCH. ;)
>>>
>>> -MC
>>>
>>>
>>> On Tue, Sep 16, 2014 at 3:24 AM, Stanislav Sinyagin <ssinyagin at gmail.com
>>> > wrote:
>>>
>>>> if you use a simple bridge command with ignore_early_media=true, I
>>>> think the caller will still hear the FreeSWITCH'es ringback instead of the
>>>> GSM unavailability message. So, in this case, the caller would simply hang
>>>> up after waiting for too long.
>>>>
>>>> You can also configure a group call with answer confirmation: the
>>>> called party would have to press a digit before the call is connected with
>>>> the caller.
>>>>
>>>> Also you can do some scripting and process the outbound call before you
>>>> bridge it with the inbound call. Here I have an example in Perl:
>>>> https://jira.freeswitch.org/browse/FS-6746
>>>>
>>>> Also currently I'm learning how to do that with ESL and Golang.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Tue, Sep 16, 2014 at 10:54 AM, Delifisek Tux <
>>>> delifisek.tux at gmail.com> wrote:
>>>>
>>>>> Hello Everyone.
>>>>>
>>>>> Is there any way to detect early media Automatic Message Detection
>>>>> before the answer in freeswitch.
>>>>>
>>>>> We had small asterisk setup for outgoing messages, GSM voice mails box
>>>>> are troubles us.
>>>>>
>>>>> Providers sends voice messages as early media. So we need to detect
>>>>> them before the answer and hangup the line.
>>>>>
>>>>> Before dig deep, we asking for is this possible with freeswitch ?
>>>>>
>>>>> Our Best Regards.
>>>>>
>>>>>
>>>>> _________________________________________________________________________
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>>>>>
>>>>> 
>>>>> 
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>>>>
>>>>
>>>>
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>>>>
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>>
>>
>> _________________________________________________________________________
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>> http://www.freeswitchsolutions.com
>>
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>>
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>
>
> _________________________________________________________________________
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> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
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> http://confluence.freeswitch.org
> http://www.cluecon.com
>
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