[SR-Users] Using kamailio to play early media announcements

[Carsten Bock]

Hi,

a typical usecase for

rtpproxy_stream2uac(prompt_name, count),
rtpproxy_stop_stream2uac()

is "MusicOnHold". In this case, Kamailio does not have to create a new
SDP, but it would only insert the RTPProxy to play the prompt.

Kind regards,
Carsten

2013/8/28 Adnan <112linuxstockholm at gmail.com>:
> Thanks Olle. I know it's like asking MySQL to implement a picture filter ..
> :-)  but I am still wondering in what scenario do we use the following two
> functions from the rtpproxy module:
>
> rtpproxy_stream2uac(prompt_name, count),
> rtpproxy_stop_stream2uac()
>
> I am using the latest kamailio 4.0.3 and rtpproxy is running on the same
> machine and have encoded the voice prompt using makeann that comes with the
> rtpproxy.
>
> Would it playback the prompt as early media if kamailio on receiving the
> INVITE from the phone, replies with 183 Ringing with some manually crafted
> suitable sdp attached, can I then use some the above functions to playback
> the prompt as early media?
>
> I know it works with SEMs and others media gws and granted that it is a
> functionality not expected from a proxy but I am simply interested in
> answering the question whether it is possible with latest kamailio and
> rtpproxy and there is no other requirement restricting one when it comes to
> the configuration.
>
> If early media playback is not possible then what are the above rtpproxy
> functions for?
>
> /Adnan
>
> On Sat, Aug 17, 2013 at 12:27 PM, Olle E. Johansson <oej at edvina.net> wrote:
>>
>>
>> 16 aug 2013 kl. 16:48 skrev Adnan <112linuxstockholm at gmail.com>:
>>
>> Hi,
>>
>> I know that this is not the purpose of the proxy but there is a situation
>> in which our kamailio needs to playback early media for a small number of
>> calls.
>>
>> Which module will be most suitable for this?
>>
>>
>> One way is to use rtpproxy and just functions such asrtpproxy_stream2...
>> to play back the prompts to the caller.
>>
>> Note that the caller is not behind NAT or behind any symmetric firewall.
>> So we a free to choose.
>>
>> We know we could do it easily by dispatching to asterisk where we use the
>> Progress() app or similar for freeswitch but we don't want add the overhead
>> of a new media server installation and configuration.
>>
>> We need a kamailio based one box solution.
>>
>> Then you have to write your own module, since Kamailio by design does not
>> handle media. Period.
>>
>> It's like asking MySQL to implement a picture filter for filters stored in
>> the database, it's just not in the design. Kamailio is a SIP server that
>> works with many media servers, but it's not a media server.
>>
>> Having said that you can propably fake a 183 and have a media server like
>> SEMS do it, but adding Asterisk is pretty much the same.
>>
>> /O
>>
>>
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>>
>
>
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