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
allow=ulaw			; Allow codecs in order of preference
relaxdtmf=yes			; Relax dtmf handling
useragent=BillsPBX		; Allows you to change the user agent string