Hi, I am just now confusing about the way of works of 2 SER Server. As you know, I set up 2 SER server and a both work perfectly, they added Identity and Identity info in the Request INVITE message, but as the way don't like I want. some facts(I use xlog() to realize this scenario ): A belong to SER1 and B belong to SER2. When A call B, the "main route logic" of SER2 (server of B) is done and when B call A, the "main route logic" of SER1(Server of A) is done. That mean, i can't add Identity into INVITE message of A of SER1 before this message come to B of SER2 because INVITE message of A isn't done with "main route logic" by server of A. How can I do "main route logic" of my SER server by myself INVITE message before it sends to another server? Or I have to set up a proxy for myself and after this proxy added Identity then it will be forward to another SER server? Thank you in advance. Tuan.