[OpenSBC] Can OSBC meet this use case?

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Hi all,

I have a use case that require the OSBC as a proxy between the UA and the other IMS network. The diagram is like below:

UA &lt;---------&gt;OSBC&lt;------------------&gt;Outbound Proxy&lt;--------------&gt;IMS network.(ims.domain.com)

10.0.0.1        10.0.0.2                           10.0.0.3                                    anything else 

As I think the PROXY mode can meet this use case, but unlucky it didn't.

some configurations:

UA:  Server: ims.domain.com

         outbound proxy: 10.0.0.2

OSBC: Proxy Mode

       Proxy-Relay-Routes: [sip:*@ims.domain.com:*]sip:ims.domain.com:5060, 10.0.0.3:5060

       Internal-DNS-Mapping : [sip:ims.domain.com]sip:10.0.0.3

but after the UA send the REGISTER to the OSBC, it doesn't relay it to the 10.0.0.3.

Anything can be done more? Or any advices and proposal? Thanks in advance! 