?Hi, I have make some changes in FreeSwitch request, and sending my request to "sip:b9c280dd:7678b8c4@sip.nexmo.com" (here, b9c280dd is api_key and 7678b8c4? is api_secret of Nexmo account). I feel it has start ?communicating with Nexmo for making a call on Mobile number but not able to make a call due to "Unauthorized" response. I am using FreeSwitch httapi "Dial" command for sending this request to Nexmo, and setting all required parameter (prefix with "sip_h_?") before sending it to Nexmo (as mentioned in attached log file), But I am getting Missing Authenticate Header!? response from Nexmo and its hang up the FreeSwitch call after CALL_REJECTED? from Nexmo. I have trace a SIP traffic and please find a log file as an attachment. I need to set Authenticate Header and all required parameter of Nexmo API by FreeSwitch "Dial" command, please suggest me for the same. Thanks, Regards, Manish Talwar ________________________________ From: Michael Collins <msc@freeswitch.org> Sent: 28 October 2014 01:43 To: FreeSWITCH Users Help Subject: Re: [Freeswitch-users] Help Required for Outbound call ?You'll need to inspect the SIP traffic between FreeSWITCH and the gateway to see what is happening. I suspect that the other SIP server is failing the call but you won't know why until you start digging and the first place to do that is the SIP traffic. -MC