Instruction manual

Internet Protocol (IP)
Issue 4 May 2003 145555-233-767
Shuffling and hairpinning
Shuffling and hairpinning can improve traffic handling performance and improve
voice quality by more efficiently using both Communication Manager switching
fabric by allocating, when possible, available IP network resources.
“Shuffling” means rerouting the audio channel connecting two IP endpoints. After
shuffling, the audio which previously was carried in a mixed connection of IP
signaling and TDM bus signaling, goes directly through the LAN or WAN
between the two IP endpoints. Shuffling also can mean reversing this process if an
endpoint requests a resource to support a feature, such as conferencing that
requires the TDM bus.
“Hairpinning” means rerouting the audio channel connecting two IP endpoints so
that the bearer (audio) packets are routed through the TN2302AP IP Media
Processor board in IP format, without having to go through the IP to TDM
conversion or traverse the TDM bus.
NAT with shuffling
Communication Manager allows IP endpoints to shuffle if they are behind a
Network Address Translation (NAT) device in an IP network.
NOTE:
Network Address Translation (NAT) is a method to address the shortage of
IP V4 addresses by allowing globally register IP addresses to be reused by
native networks. A NAT device translates between translated and native
IP addresses.
Communication Manager supports IP direct calls (a call that has been shuffled)
between two IP endpoints that are translated through a NAT device.
Variable length ping
Provides an enhancement to the ping command included in R7.1. This
enhancement specifies a longer packet to be sent by ping and shows if a router or
host has a problem fragmenting or integrating transferred packets.
Variable Length Subnet Mask (VLSM)
VSLM is a redefinition of the subnet mask, allowing for a more efficient
allocation of IP addresses within a traditional classful block when administering
IP address on Communication Manager.