This attribute specifies which functions are supported. This may be
one or more of the following:
borderNode - If present, indicates that border node functionality is
supported.
centralDirectoryServer -If present, indicates that the node is a
central directory.
gateway - If present, indicates that the node provides gateway
functions.
isr - If present, indicates that the node supports intermediate session
routing.
Description of bits:
notused0(0)
gateway(1)
centralDirectoryServer(2)
hpr(3)
rtp(4)
isr(5)
borderNode(6)