Hello Mojtaba,

I chose asterisk as media server and some services like voice mail provided ... about CRBT I know asterisk have this service but I don't know how to send this request from kamailio to asterisk..

do you know kamailio can provide this service itself or not???

could you pls explain more 

thanks

On Sat, Sep 28, 2019, 1:48 PM Mojtaba <mespio@gmail.com wrote:

Hello, Some consideration would be needed:

1) SS7 for PSTN subscriber to support media-relay

2)Progress capability  for SIP subscriber.

3) Media server to support ring-back VAS service

You should check enabling this service or not during MO procedure.

With Best Regards.

On Sat, Sep 28, 2019 at 1:19 PM Maryam Baghdadi <maryam.baghdadi@gmail.com> wrote:

Hello everyone,

Is it possible to relay INVITE request to another server after receiving "180 Ringing" response ???

I would like to activate CRBT(ring back tone) service and according to my research after receiving 180 ringing media playing request should be sent to a media server .

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--Mojtaba Esfandiari.S