[OpenSBC] opensbc-openimscore interworking - upper registration route setting has no effect?

[sui e. <sui...@gm...>]

Hi,   


 I have the following setup for OpenSBC and OpenIMSCore interworking:   


UA ----> OpenSBC ----> (pcscf:4060) of OpenIMSCore ----> VCC AS   


OpenSBC is configured as B2BUpperReg mode.   


Upper Registration Routes is set to IPAddressOfPcscf:4060   


When UA registers, the Registration is forwarded from OpenSBC to OpenIMSCore domain but not on the configured P-CSCF port of 4060, it went to well known port 5060 (which is the port for I-CSCF) and I-CSCF responded with the message: "400 Bad Request - P-Visited-Network-ID header missing".   


It seems the configuration of Upper Registration Routes has no effect, the Registration is forwarded based on configuration of OpenIMSCore domain and the port forwarded to is well known port of 5060 (not 4060).   


Has anyone encountered this? Is there a way to make this work?   


Thanks, 


sshee