yes ,iam using now flags for other type of SiP headers ( in callflow doc and in special resource) so all users have this sip header for outbound calls , but in this case each user have different sip header value (users account id , X-account=1234) , so going this way i should create for each user : callflow with call group and special resource with sip header , it may be not efficient , maybe there is any other way ? it will be great to have posibility to inject any sip headers in any point of callflow (callflow action)