Need help to setup asterisk inside firewall protected LAN

Hi I am trying to configure asterisk inside a Firewall protected LAN(Asymmetric NAT) only for internal use for my company,but without any luck after 10 days.

I want a very basic setup to connect all the users inside company.Can anyone provide me a simple step by step guide how to configure extensions.conf & sip.conf file in detail.

Also i want to inform that my ASTERISK server and sjphone/SIP clietns are all inside same LAN & my asterisk server has static ip but it doesn't have a public domain name/public IP. Is is necessary to have a public IP for the asterisk server?

I have identical set up as you. My outgoing (using SIP provider) and incoming DID is working but pstn in and out remains a mystery (misery).
These are the relevant lines I have:
sip.conf

externip=xxx.xxx.xxx.xxx
localnet=192.168.0.0/255.255.255.0

assuming your Asterisk box has ip like 192.168.0.15. if you have 192.168.2.10, then localnet=192.168.2.0

these 2 lines are also in my sip_nat.conf. I'm not sure if they are needed or not.

In your router, forward whatever ports you use for Asterisk:
SIP (default 5060 UDP)
RTP - also UDP, check in rtp.conf, you need to forward whatever is rtpstart to rtpend to Asterisk

Where is the sip_nat.conf file? I am using
asterisk 1.4.9. Are you talking about asterisk 1.2.24?

and what is externip=xxx.xxx.xxx.xxx?Is it the static ip of my asterisk server.I dont have any public ip or domain.Do i need to co0nfigure any public domain?

What is meant by outgoing sip provider & incoming DID? Can i do without them?Becuase my first target is to configure asterisk only inside firewall/LAN and connect few phones inside my copmpany.Looking forward to your reply.. THANX

Okie Dokie then...

Get your hands on "Asterisk - The Future of Telephony".
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Brett

Quote:

Where is the sip_nat.conf file? I am using

You wont have one.

This is an included file that is used in Trixbox.
The localnet and externip are set in the general section of sip.conf

Ian

Hi,
There is a tutorial on this site where you can setup and run a Asterisk with Debian Etch 4.0, it also supports a repository for easy integration of your needs, take a look and I am sure within 5 hours you will be running a PBX you are happy with.
http://www.astertools.com/tutorials

Regards,
Alfred