_____________________________
From: Tihomir Culjaga <tculjaga@gmail.com>
Sent: Wednesday, March 21, 2018 7:02 am
Subject: Re: [Freeswitch-users] 183 early media" followed by 180 Ringing From Mobile Carriers
To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org>


Hi, im not sure about the callflow you have so i suppose its an incoming call from a carrier to freeswitch and you want to generate an inband ringback to the calling user. In that case you use pre_answer followed by ring_ready. Of course you set ringback var to a tone or wav file so freeswitch can actually generate that inband.

Hi Guys,

Sorry to bring this up again but I see it when performing interopt testing with mobile carriers.

A number of them due to ISUP interworking, have gateways that generate a 183 with SDP, then a 180ringing.

I understand from ready for example this jira case FreeSWITCHFS-3859 SOFIA "183 early media" followed by "180 Ringing" where this is done by design.

I just wondered if this position had changed and if there is a configuration parameter/option that can allow any early media message to be sent back to A leg by freeswitch, in particular a 183 with SDP, then a subsequent 180 ringing, as carriers tend to want to see both.

Many thanks

Jon

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