sip.conf:

[general]
context=default			; Default context for incoming calls
;allowguest=no			; Allow or reject guest calls (default is yes, this can also be set to 'osp'
				; if asterisk was compiled with OSP support.
;realm=mydomain.tld		; Realm for digest authentication
				; defaults to "asterisk"
				; Realms MUST be globally unique according to RFC 3261
				; Set this to your host name or domain name
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


[xlite]
type=friend
host=dynamic
dtmfmode=auto
secret=1234
context=default



extensions.conf:

[general]
static=yes
writeprotect=no
autofallthrough=yes
clearglobalvars=no
priorityjumping=no

[globals]
CONSOLE=Console/dsp				; Console interface for demo
;CONSOLE=Zap/1
;CONSOLE=Phone/phone0
IAXINFO=guest					; IAXtel username/password
;IAXINFO=myuser:mypass
TRUNK=Zap/g2					; Trunk interface

TRUNKMSD=1					; MSD digits to strip (usually 1 or 0)
;TRUNK=IAX2/user:pass@provider

[default]
exten => _1NXXNXXXXXX,1,Dial,IAX2/cr4z3d@NuFone/${EXTEN}