For info:
I had to setup a PBX for a day. The situation was like this:
- connectivity with cable-modem, dynamic dns and DLink router
- SME7+Selintra on a laptop (P-III/1GHz/500MB/20GB)
- onboard NIC and PCIMCIA NIC.
- 2 sip phones (Grandstream BudgeTone 10)
- VoIP Provider (unlimitel.ca) via IAX2
- ddclient contribs for dynamic dns
- a switch for 2 hard-phones
To have the pcmcia card working I did this (from bugtracker):
cd /etc/rc7.d
ln -s ../init.d/pcmcia S36pcmcia
reboot
Then from the console I set WAN (dhcp-client), LAN (dhcp-server) and from the server-manager I disabled as many options as possible (mail, proxies)
I edited sip.conf header ([general]) to add this:
# NAT=yes enables a form of Symmetric RTP in Asterisk
nat=yes
externip=mypbx.dyndns.org
fromdomain=mypbx.dyndns.org
localnet=192.168.X.0/255.255.255.0
qualify=yes
Port TCP/UDP 4569 was opened on the router and directed to the pbx for inbound calls.
It worked fine and users did not report any audio inconvenient with about 250 outbound calls.
Thanks for the Selintra team!