If you are using SIP, then anything in the Headers in the SIP message are subject to being examined by some 3rd party. They are not secure. They could also be spoofed or intercepted and modified (man in the middle). You can use SIPS, that is why it was designed. Don't know what kind of issue this would raise with carriers. Another possibility since you control the original destination and the actual destination system. Use a common database, put a record into the DB that the call is being transferred and use as the postd number the Key. Probably should put From (ANI), To (DNIS), user info, and other information into the record. On the receiving side, look up the entry/record, verify what can be verified, the use the information in the record to determine the user. This is similar to the sophisticated capabilities used in some ACD installations. -- View this message in context: http://freeswitch-users.2379917.n2.nabble.com/Two-FreeSWITCH-Box-IVR-Call-Tr... Sent from the freeswitch-users mailing list archive at Nabble.com.