Public IP 0n lan - not similar to the old ones

[earthplug]

Hi Guys,

I'm new here!

I'm trying to set up Asterisk on my local network, I just switched to pfSense to achieve the following:

I run my office on static ip lines, my ISP have given me two sets of ips
WAN BLOCK: 115.xxx.xxx.xxx/29
LAN BLOCK: 182.xxx.xxx.xxx/29

I would want to have my pfSense to be set on one of my WAN BLOCK ips' and have completed this.
EX: 115.xxx.xxx.124

Now I really have to put my Asterisk Box on a public ip cause they forward all my incoming calls to an extension.
EX: 115.xxx.xxx.125
My VOIP provider would transfer all my calls to
100@115.xxx.xxx.125:5060

Can I have 115.xxx.xxx.125 assigned to my Asterisk BOX permanently?

How do I attain this?
If I configure a VIP or an alias with 115.xxx.xxx.125 and do a 1:1 NAT. will i be able to access my Astrisk GUI from the outside world?

Please help me with this.

[craigduff]

Quick question why has your isp given you a Lan address? The 182 address is not an a,b,c class address?