<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">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.<br><br><div id="AppleMailSignature">Sent from my iPhone</div><div><br>On 19 Mar 2018, at 20:41, Jonathan Hunter <<a href="mailto:hunterj91@hotmail.com">hunterj91@hotmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<div>Hi Guys,</div>
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<div>Sorry to bring this up again but I see it when performing interopt testing with mobile carriers.</div>
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<div>A number of them due to ISUP interworking, have gateways that generate a 183 with SDP, then a 180ringing.</div>
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<div>I understand from ready for example this jira case FreeSWITCHFS-3859 SOFIA "183 early media" followed by "180 Ringing" where <span style="font-size: 12pt;">this is done by design.</span></div>
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<div>I just wondered if this position had changed and if there is a configuration parameter/option that can allow any early media message <span style="font-size: 12pt;">to be sent back to A leg by freeswitch, in particular a 183 with SDP, then a subsequent
180 ringing, as carriers tend to </span><span style="font-size: 12pt;">want to see both.</span></div>
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<div>Many thanks</div>
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<div>Jon</div>
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