I would like to ask all of you some question that i would like to use voip from HQ to my branch.
The connection from HQ to branch i used VPN site to site and the connection is working but i don't know
which equipment that i can use Voip from HQ to branch?
Note: at HQ site i used Router 2811 and Branch site i used Router 1841.
You can find a few sample configurations as well as the best practices in the SRND and also have a look at the CME configuration guides for more information.
As mentioned above, if you are the end user it is strongly advised to speak with a Cisco partner who can assist you with the design and implementation.You can use the Partner Locator tool to find a partner in your area.