REGISTER forwarding problem

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Hello,

I have a following setup: UA > opensips > REGISTER > asterisk >
userdb, where opensips forwards register requests.

For some reasons Asterisk¬†1.6.2.18 doesn’t want to accept REGISTER
forwarded through opensips.

Here is SIP trace http://pastebin.com/ebV62r7b .

What can possibly cause this behaviour?