/etc/asterisk/sip.conf

etcasterisksip.conf.txt

[general]
udpbindaddr=0.0.0.0             ; IP address to bind UDP listen socket to (0.0.0.0 binds to all)
transport=udp                   ; Set the default transports.  The order determines the primary default transport.

context=default
srvlookup=yes
videosupport=yes

disallow=all   ; First disallow all codecs
allow=ulaw
allow=alaw     ; Allow codecs in order of 
allow=ilbc     ; preference
allow=gsm
allow=h261

[101]
type=friend
secret=welcome
qualify=yes    ; Qualify peer is not more than 2000 mS away
nat=no         ; This phone is not natted
host=dynamic   ; This device registers with us
canreinvite=no ; Asterisk by default tries to redirect
context=home
;port=5061     ; Uncomment this line if Ekiga and Asterisk
               ; are on the same host