connect NORTEL CS1K Rls 4.5 ON SIP TRANKS (REDIRECT) TO LG IPECS

I'm try to connect NORTEL CS1K Rls 4.5 ON SIP TRANKS (REDIRECT) TO LG IPECS. NEED HELP. WE HAVE PING BOTH SIDES. FROM NORTEL TO LG I GET ANSWER 501 ("SIP response 501") - 501 Not Implemented. FROM LG TO NORTEL THERE IS NOTHING ON THE SNIFER. WHAT TO DO?

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bahaluly
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