Looking at your registration I see a problem:
Linksys/PAP2T-3.1.15(LS)
sip:919XXXX@192.168.1.102:5060 sip:69.XXX.XXX.XX:29382 udp:74.52.58.50:5060 2009-02-27 17:58:16
Linksys/PAP2T-3.1.15(LS) sip:919XXXX@192.168.1.102:5061 sip:69.XXX.XXX.X:5061 udp:74.52.58.50:5060 2009-02-27 17:58:16
Notice on your first line, your router is randomizing the port. On the 2nd line it is not. So likely the NAT binding are getting messed up.
Do you have ALG enabled on it?
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