[Serusers] how can I config ACK message

[甘海华]

serusers，hello！
   I want this: I uses SER as register server, when UAC invite, SER send message to other sip server(name:ABC),
and the ABC send back the message to SER,SER forward it to callee, and the dialog will been established, but the caller ACK message doesn't through the ABC, I want it through it, how can I config ther ser.cfg to achieve the route, thanks.
   I want achieve as follow stream, the both SER is a same SER program.
INVITE: caller --->SER--->ABC--->SER--->callee
200OK:  caller <---SER<---ABC<---SER<---callee
ACK:    caller --->SER--->ABC--->SER--->callee

	

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　　　　　　　　甘海华
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　　　　　　　　　　2006-04-14