[SR-Users] Make SIP session between two kamailio servers

Hi everyone, I am curious if there is a way to make SIP session between two kamailio server instances eg. if there is way to use kamailio as an SIP client and SIP server at the same time. I am thinking about the following configuration: kamailio main server ----- kamailio server B ----- SIP client B1 | | | kamailio server A ----- SIP client A2 | | | SIP client A1 I want to be able to make SIP session between: SIP client A1 : SIP client A2 kamailio server A : kamailio server B SIP client A1 : SIP client B1 (this would be great) If there is currently no way to do this do you think that it would be possible to create the module which will support this kind of functionality? Thanks in advance for the replies