System information

over SIP. In our example, we will creatively refer to the two servers as serverA and
serverB.
The first file that must be modified is /etc/asterisk/sip.conf. This is the main configura-
tion file for setting up SIP accounts. First, this entry must be added to sip.conf on
serverA. It defines a SIP peer for the other server:
[serverB]
;
; Specify the SIP account type as 'peer'. This means that incoming
; calls will be matched on IP address and port number. So, when Asterisk
; receives a call from 192.168.1.102 and the standard SIP port of 5060,
; it will match this entry in sip.conf. It will then request authentication
; and expect the password to match the 'secret' specified here.
;
type = peer
;
; This is the IP address for the remote box (serverB). This option can also
; be provided a hostname.
;
host = 192.168.1.102
;
; When we send calls to this SIP peer and must provide authentication,
; we use 'serverA' as our username.
;
username = serverA
;
; This is the shared secret with serverB. It will be used as the password
; when either receiving a call from serverB, or sending a call to serverB.
;
secret = apples
;
; When receiving a call from serverB, match it against extensions
; in the 'incoming' context of extensions.conf.
;
context = incoming
;
; Start by clearing out the list of allowed codecs.
;
disallow = all
;
; Only allow the ulaw codec.
;
allow = ulaw
Be sure to change the host option to match the appropriate IP address
for your own setup.
148 | Chapter 7: Outside Connectivity