[asterisk-dev] Clear a secret from sip.conf and phone sill can dial

[SAMPro]

I have set an extension in sip.conf to have a password and configured the
phone accordingly. Then I have edited the sip.conf again and removed the
password and reload the asterisk, but the phone can dial or dialed.

[1801](general)
allow=ulaw
dtmfmode=auto
call-limit=2
;secret=pass1

The similar behavior in Cisco systems is different and the phone can't dial
or dialed.
Using command "sip unregister" didn't resolve this.
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