http://www.sipnet.ru/

http://wiki.sipnet.ru/index.php/Пример_настроек_для_Asterisk_1.6

server# cat sip.conf

[general]
...
disallow=all
allow=alaw
...
[sipnet_SIPID]
type=peer
secret=SIPPASSWORD
defaultuser=SIPID
fromuser=SIPID
fromdomain=sipnet.ru
host=sipnet.ru
callbackextension=sipnet_SIPID
insecure=invite
context=incoming
nat=no
directmedia=no

[sipnet_SIPID]
type=registration
outbound_auth=sipnet_SIPID_auth
server_uri=sip:sipnet.ru
client_uri=sip:SIPID@sipnet.ru
retry_interval=60
expiration=120
contact_user=sipnet_SIPID

[sipnet_SIPID_auth]
type=auth
auth_type=userpass
password=SIPPASSWORD
username=SIPID

[sipnet_SIPID]
type=aor
contact=sip:sipnet.ru:5060

[sipnet_SIPID]
type=endpoint
context=incoming
disallow=all
allow=alaw
allow=ulaw
outbound_auth=sipnet_SIPID_auth
aors=sipnet_SIPID
from_user=SIPID
from_domain=sipnet.ru
direct_media=no

[sipnet_SIPID]
type=identify
endpoint=sipnet_SIPID
match=sipnet.ru