[Freeswitch-users] FreeTDM and ring_ready

[Siri MM]

Hi Moises,

Thanks for the reply. I am using a SNOM 320 phone as SIP end point. On
being invited, it sends back a SIP/2.0 180 Ringing. How does
FreeSWITCH/FreeTDM behave in this case - would it send media as part of the
Progress message (in band)? Is there a way for me to check if media is
being sent out to the caller?


On Mon, Dec 2, 2013 at 5:12 PM, Moises Silva <moises.silva at gmail.com> wrote:

> On Sun, Dec 1, 2013 at 6:29 PM, Siri MM <sirimmfs at gmail.com> wrote:
>
>> Hi,
>>
>> I have been using Sangoma A102 card with wanpipe-3.5.28 and FS 1.2.8.
>>
>> At a couple of different customer sites, common issue reported is, when a
>> call is made from external world (mobile/fixed line), although the
>> destination extension rings, no ringback is heard at the caller end.
>>
>> Extension dialplan is to bridge to the desired extension, something like:
>>  <action application="bridge" data="user/3001" />
>>
>> On capturing the isdn traces, I see that packet exchanges involve SETUP,
>> CALL PROCEEDING, and ALERTING (with a progress indicator saying "Call is
>> not end-to-end ISDN - progress information available in-band")
>>
>> After experimenting a bit, what I find is, ringback is heard if I were to
>> modify my dialplan as follows:
>> <action application="ring_ready" />
>> <action application="set" data="ringback=$${uk-ring}"/>
>> <action application="bridge" data="user/3001" />
>>
>> This time, ISDN traces have the following: SETUP, CALL PROCEEDING,
>> ALERTING (with a progress indicator saying "Call is not end-to-end ISDN -
>> progress information available in-band"), and PROGRESS (with a progress
>> indicator saying "In-band information or an appropriate pattern is now
>> available")
>>
>> My question is, while working with FreeTDM, do I need to always set
>> ringback explicitly? Could somebody please help me understand this
>> correctly?
>>
>
> Not always. It depends very much on your situation. In many cases the
> telco plays the media regardless of what you send. In your case it seems
> you want to bridge the call to a given SIP endpoint. My guess is that SIP
> endpoint is never sending 183 or even if it sends 183 is not sending media.
> In such cases, if you want to provide media, yes you have to execute
> ring_ready and let FreeSWITCH play the media (ie, through the ringback
> variable, using playback, etc)
>
> Moy
>
>
> *Moises Silva **Manager, Software Engineering*
>
> msilva at sangoma.com
>
> Sangoma Technologies
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