Asterisk (Freepbx)

You must choose a proxy (or set up two trunks - one for each proxy) - so use cust02.sip.weblink.se or cust01.sip.weblink.se as host.

Create a SIP Peer:

username = <username>

type = friend

secret = <password>

insecure = port, invite

host = cust02.sip.weblink.se

context = from-pstn

canreinvite = no

qualify = yes

and the registration:

<username>: <password> @ cust02.sip.weblink.se