Question : Distributing VOIP out to remote offices

I have Cisco Call Manager v4.1 as a PBX and Cisco Unity Messaging System.
I have two T1 data circuits here inhouse and a T1 at each remote location.
All  calls initially route through the main office. I would like to have the ability to route and transfer some of these calls to remote locations as if they were here on the local LAN. I am using cisco 7940 ip phones at these remote offices. What do I need in addition to make this happen? I know I'll need QoS routers at these remote offices. Does anyone know of a good low end router that could handle this type of traffic and what type of configuration is needed. I have a highend Adtran router here at the main office - what type of configurations will I need on this? How will I make the connection at from the main office to the remote? Will it be by static IPs ? Has anyone done this enough times before to fill in the gaps. I'm reading about it but the concepts are not precise. Mabye I'm reading the wrong text....does anyone know of any text that offer simplified instructions for this type of setup?  

Answer : Distributing VOIP out to remote offices

There needs to be a device, server, router, etc., at the remte sites that hands out IP addresses to the phones. Assuming that there is a low headcount at the branches you would need a SIPARATOR at the main office which would route the calls through the PBX. The capacity of the SIPARATOR would depend on the number of call it has to route. Have a look at Ingate http://www.ingate.com/siparators.php