Exten acting strange

Very Strange

Cisco 7941
Exten 201 D SCCP/201 in & out ok
Exten 202 D SCCP/202 out ok, in says extension not available
Exten 203 D SCCP/202 in ok

Linsys SPA942
Exten 101 D SIP/101 in & out ok
Exten 102 D SIP/102 out ok, in it will ring 101

Put phone on different Exten everything works fine
Deleted 102, rebooted, factory default on phone, created 102 again, voicemail message light came right back.
I have had a few more Exten acting funny, they never seem to get totally deleted.

How can I do a better job of deleting Exten from Users