Thanks Brian. Other end in this case is under development so I have some flexibility there. Here is how I am stuffing it right now <action application="set"><![CDATA[sip_h_User-to-User=${sip_Call_ID};tenant=1101;DID=${sip_to_user}]]></action> It looks good in wireshark. Please let me know if you see a problem. From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Brian West Sent: Tuesday, March 07, 2017 3:12 PM To: FreeSWITCH Users Help Subject: Re: [Freeswitch-users] Setting user to user information (UUI) https://tools.ietf.org/html/rfc7433 User-to-User is what I recall, but that all depends probably on what you're talking to on the other side. /b On Tue, Mar 7, 2017 at 3:41 PM, Varsha Agarwal <vagarwal@vertical.com<mailto:vagarwal@vertical.com>> wrote: Are you pointing to #define SOFIA_SIP_HEADER_PREFIX "sip_h_" As I mentioned, I can add a custom field in the header my question is if that is the standard way of stuffing UUI is SIP header? I tried to find a sample but could not. From: freeswitch-users-bounces@lists.freeswitch.org<mailto:freeswitch-users-bounces@lists.freeswitch.org> [mailto:freeswitch-users-bounces@lists.freeswitch.org<mailto:freeswitch-users-bounces@lists.freeswitch.org>] On Behalf Of Sergey Safarov Sent: Tuesday, March 07, 2017 1:07 PM To: FreeSWITCH Users Help Subject: Re: [Freeswitch-users] Setting user to user information (UUI) Look at headers prefix present here<https://freeswitch.org/stash/projects/FS/repos/freeswitch/browse/src/mod/endpoints/mod_sofia/mod_sofia.h#115-123> вт, 7 мар. 2017 г. в 22:43, Varsha Agarwal <vagarwal@vertical.com<mailto:vagarwal@vertical.com>>: I tried adding a custom header "CallInfo" for ex. sip_h_callInfo and I see that it gets added to SIP header and passed along. But what's confusing is just adding var sip_h_User_to_User is same as adding a SIP UUI as per RFC or there is more to it. Any help would be great. From: freeswitch-users-bounces@lists.freeswitch.org<mailto:freeswitch-users-bounces@lists.freeswitch.org> [mailto:freeswitch-users-bounces@lists.freeswitch.org<mailto:freeswitch-users-bounces@lists.freeswitch.org>] On Behalf Of Brian West Sent: Tuesday, March 07, 2017 11:29 AM To: FreeSWITCH Users Help Subject: Re: [Freeswitch-users] Setting user to user information (UUI) I know we parse User-to-User header, I'm not aware if we can set it, have you tried setting the var sip_h_User-to-User? On Tue, Mar 7, 2017 at 1:14 PM, Varsha Agarwal <vagarwal@vertical.com<mailto:vagarwal@vertical.com>> wrote: Hi, In Freeswitch, is it possible to set SIP UUI (user to user information) before transferring the call another application? We want to add some information to the call so the application on the other end can retrieve it? Thanks, Varsha _________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org<mailto:consulting@freeswitch.org> http://www.freeswitchsolutions.com Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org<mailto:FreeSWITCH-users@lists.freeswitch.org> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org -- Brian West brian@freeswitch.org<mailto:brian@freeswitch.org> Twitter: @FreeSWITCH , @briankwest http://www.freeswitchbook.com http://www.freeswitchcookbook.com Allison prompts for FreeSWITCH: https://www.gofundme.com/allison-prompts-for-freeswitch Got Bugs? 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Report them here<https://freeswitch.org/jira>! | Reddit: /r/freeswitch<https://www.reddit.com/r/freeswitch> T:+19184209001 | F:+19184209002 | M:+1918424WEST (9378) Skype:briankwest