R--------------- [[ Telephony SITE 2 ]]
  / \
 /   \
/     \
R4   R3
|\    /|
| \  / |
|  \/  |
|  /\  |
| /  \ |
RO    R2
 \    /
  \  /
   \/
    R-------------- [[ Telephony SITE 1 ]]