Cisco 7960 SIP image with Asterisk

It appears that the Cisco 7960s with the SIP image (7.3) doesn't produce a UDP checksum on its SIP packets. When it tries to communicate with asterisk, it reports: "chan_sip.c:7798 sipsock_read: SIP: Received packet with bad UDP checksum." I'm stuck. How did all the others get this to work? Please HELP!

Thanks Bo

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