Someone

[general]
context=incoming                ; Default context for incoming calls
;context=default                ; Default context for incoming calls
bindport=5060                   ; UDP Port to bind to (SIP standard port is 5060)
bindaddr=0.0.0.0                ; IP address to bind to (0.0.0.0 binds to all)
srvlookup=yes                   ; Enable DNS SRV lookups on outbound calls
externip=216.181.46.42
allowguest=yes                  ; Allow or reject guest calls (default is yes, this can also be set to 'osp'
videosupport=yes

[xlite]
type=friend
secret=xxxxxx
qualify=yes
nat=no
host=dynamic
canreinvite=no
context=internal
port=5061
callerid=My Computer <110>

[xlitehome]
type=friend
secret=xxxxxx
qualify=yes
nat=no
host=dynamic
canreinvite=no
context=internal
port=5061
callerid=LR Computer <111>

[polycom]
type=friend
username=103
qualify=yes
secret=xxxxxx      ;Password for the extension
context=internal   ;Use the applicable context from extensions.conf
host=dynamic
mailbox=100@default
callerid=Home Polycom IP Phone <103>   ;Important to use the <extension#>
                       ;so caller ID and voicemail shortcuts work properly