[Asterisk-Users] 404 "Not Found" Sip Response

[William Betts]

The hardware I currently have is:

TDM400P  with 3 FXO ports, and 1 FXS port
4 Cisco 7960 Phones (only 1 is currently configured for testing purposes)
Asterisk on slack 10 

I can dial out just fine via the Cisco phone, but when I try to dail
in I get the following output when I load asterisk up in debug mode.

 -- Got SIP response 404 "Not Found" back from <ip_address_of_sip_phone>
    -- SIP/20-e3a9 is circuit-busy

I have looked several places for an answer to this and I haven't found
one. Any input from the users on this would be a great help. Here is
what is in my sip.conf and extensions.conf file.

Thank You,
William Betts

[general]
port=5060
bindaddr=0.0.0.0
tos=lowdelay
disallow=all
allow=ulaw
context=local-access

[20]
type=friend
username=w0
secret=m3
host=64.123.157.103
canreinvite=no                 
qualify=200                    
disallow=all
allow=ulaw
allow=alaw
allow=g729
callerid=Daves Office <20>



[extensions]
exten => 20,1,Dial(SIP/20,20)          
exten => 20,2,Voicemail(u${EXTEN})
exten => 20,3,Hangup                    
exten => 20,102,Voicemail(b${EXTEN})  
exten => 20,103,Hangup

[incoming]

exten => s,1,Answer
exten => s,2,DigitTimeout(10)        
exten => s,3,ResponseTimeout(20)
exten => s,4,Dial(SIP/20,20)
exten => t,1,Hangup                     
include => extensions