[Serusers] SER + Mediaproxy /RTProxy

[GTel]

Hello all,
I plan to use SER with MediaProxy as a far-end NAT traversal solution. As much as I understand, SER Proxy server does the actual RTP traffic forwarding between the parties.
Using SER with MediaProxy only as a far-end NAT traversal solution (or using RTProxy) can I  forward register to a 3rd party Proxy /registrar or the nated parties have to register with SER ?
Thanks for any help,
GTel
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