Please recommend a RPC system working with twisted.

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Hi all,

I'm looking for an RPC system working with twisted.

1. Binary.  I want it run faster than any xml based RPC.

2. Bidirectional.  Unlike  HTTP, on which the client has to poll the
sever for events, the server should "call" the client's method to
notify events.

3. C/Python support.  Part of the system shall be written in C.

4. Could easily integrated  with twisted.

Unfortunately, there seems no such resolution existed.  So maybe I
have to give up some requirements.

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It would be wonderful if ICE could integrate with twisted!