Chan_SS7 problem

I have installed chan_ss70.9 with asterisk 1.2.10. My asterisk connect to Excel2000 voice switch and I can make call from asterisk to Excel2000 but when i make clall form excel2000 to asterisk, i found error message in asterisk as below:

PE860B*CLI> Feb 2 10:23:29 NOTICE[10200]: isup.c:498 decode_isup_phonenum: unknown nature of address indicator 0x70.
Feb 2 10:23:29 NOTICE[10200]: l4isup.c:4060 l4isup_event: ISUP decoding error, message discarded. (typ=1)

How to resolve it?

Waiting for your reply. Any one any experience?