Thanks for answer. But it is not related to phones.
It is more related that broken sip alg in lastest version of IOS 15.3
Errrr ... I don't think so.
I have, at home, CP-7970 and a 880 router. When I first ran my 7970 with 9.X firmware, it wouldn't register with my Voice SP. When I did "sh ip nat trans | i " I am seeing the phones trying to go through a port numbers not specified in the SEPmacaddress.xml.cnf. It was basically shooting all over the place. My 7960, however, works like a treat. No problem.
Disabled ALG on the router, still no result. Enabled port forwarding, doesn't work.
In the end, I downgraded the 7970 to 8.X firmware and rolled-back the changes I made to the router and everything works.
Now, I've got an Asterisk in a Raspberry Pi with my 7970 and a handful of 7960. Works a treat!
But for me much better to force router to avoid such behavior at all. Because such SIP ALG issues happens not first time. I seen such issue at least couple of IOS versions. In one version it broken, next fixed, after couple of monthes they break it again etc.
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