Does anyone have a Cisco 7970 working on AAH?

I am trying to get a 7970 working on Asterisk. I managed to the SIP firmware loaded on the phone (version 8.0.2SR12) but it just sits there ?registering?.

This is what is repeatedly logged in Asterisk:

Aug 20 15:33:02 DEBUG[2397] chan_sip.c: = No match Their Call ID: 00179406-edda0003-74c224f2-2357f42f@192.168.1.102 Their Tag 00179406edda000323ad7de8-2fade0d9 Our tag: as2737d311
Aug 20 15:33:02 DEBUG[2397] chan_sip.c: = Found Their Call ID: 00179406-edda0002-b39e06d3-d204a310@192.168.1.102 Their Tag 00179406edda0002e44b559d-dab727a6 Our tag: as7249c94a
Aug 20 15:33:02 DEBUG[2397] chan_sip.c: **** Received REGISTER (2) - Command in SIP REGISTER
Aug 20 15:33:02 DEBUG[2397] chan_sip.c: Ignoring SIP message because of retransmit (REGISTER Seqno 121, ours 121)

Does anyone know what ?Ignoring SIP message because of retransmit? means?