VT advantage – unlimited
Posted by cciev on July 22, 2006
VTA uses CAST protocol. Uses 4224 TCP port. This protocol helps in discovering remote VTA capable endpoints, communicates with IP phone as well as with Callmanager. To ensure proper QOS is given to CAST, on the phone port, create a service policy to mark TCP 4224 with DSCP CS3.
VTA uses two types of codecs.
a. H263 – min of 128kbps to a max of 1.5 Mbps per call
b. Wideband – 7.0 mbps per call
