Asterisk @Home 1.5

To begin with, go to the Trunks tab and create a new SIP trunk. 
Use the following example to get you up and going:

Outbound caller ID: "Your Name" <1XXXXXXX> 
Maximum Channels: 4 
 
Trunk Name: FONOSIP
 
Peer Details: 
authname=XXXXXXXXXX <- Your FONOSIP sip number
canreinvite=no
context=from-pstn
dtmf=inband
dtmfmode=inband
fromdomain=fonosip.com
fromuser=XXXXXXXXXX
host=fonosip.com
insecure=very
nat=yes
pedantic=no
Qualify=yes
secret=MyPassword <- Your FONOSIP SIP password
type=peer
user=phone
username=XXXXXXXXXX

User Context: fonosip.com

User Details:
context=from-pstn
dtmf=inband
dtmfmode=inband
fromdomain=fonosip.com
host=fonosip.com
insecure=very
nat=yes
secret=MyPassword
type=user
user=XXXXXXXXXX
username=XXXXXXXXXX
 
On the DID tab, create a new DID
DID: XXXXXXXXXX <- use FONOSIP DID number

Set this new DID to use your "Normal Incoming Calls Setting".

Finally, on your "Outbound Trunks" tab, you will need to add the 
Fonosip trunk to one of your outbound trunks.

Once you save your settings, click on the red bar at the top of 
the screen, wait a few secondss, and you should be be able to send 
and receive calls through Fonosip.