Understanding the Requirements for Toll-Quality Voice Chapter 9: Network Requirements and Preparation
DiffServ/ToS = EF (configurable, recommendation is EF)
UDP (Dest. port) = 5004 (when not using SIP)
The Ethernet switch infrastructure should be configured to prioritize traffic using one of
these methods. This allows the voice traffic arriving at the switch to travel ahead of the data
ShoreTel customers typically choose to prioritize DSCP since this configuration is easy to
set up on smart Ethernet switches.
When IP phones are used, the desktop connection to the user’s computer and phone must
also be part of your switched Ethernet network. The user’s phone is connected to the port
on the Ethernet switch, and the user’s computer or other data device is connected to the
integrated two-port Ethernet switch inside the IP phone. In this configuration, the switch
port connected to the phone must be configured to prioritize the voice packets from the
phone above the data packets.
PCs connected through IP phones will lose their connection to the network if the IP phone
loses power.
Voice quality can be guaranteed by putting each of the ShoreGear voice switches and the
ShoreWare server on its own Ethernet switch port. A network with this topology meets the
bandwidth, jitter, and latency requirements for toll-quality voice without the additional
need for special prioritization of voice packets. Virtual LANs
An alternative method to prioritize voice over data is to create a separate virtual LAN
strictly for your voice traffic. The ShoreTel IP phone as well as the ShoreGear voice
switches can be configured on a specific VLAN.
Set the voice VLAN for higher prioritization in the network. The Ethernet switch
infrastructure needs to be configured to prioritize the voice VLAN. This allows the voice
traffic arriving at the switch to travel ahead of the data traffic. Wide Area Network
To manage bandwidth in the wide area network, prioritize your voice traffic ahead of your
data traffic. The voice packets on the ShoreTel 8 system always travel on UDP port 5004, so
you simply prioritize this UDP port within your routers with priority queueing. You can
prioritize based on the voice switch IP address, the MAC address, or the physical port on
the Ethernet switch. As an additional step, you can also prioritize the distributed call
control signaling that always travels on UDP port 5440 through UDP port 5445.
If the voice traffic for the call needs to flow across a WAN link, the routers needs to be
configured to prioritize voice ahead of data using one of the two tagging methods, DiffServ/
ToS or UDP 5004.
ShoreTel customers typically choose to prioritize UDP 5004 to avoid costly network
upgrades since older routers and more Ethernet switches support this function.
Additionally, configuring UDP 5004 for prioritization is easy to set up. Client Bandwidth
ShoreTel Call Managers communicate with the ShoreWare server for call information and
control, configuration changes, and advanced services such as extension monitoring. Table
9-8 provides an estimate of the client bandwidth used for each of the Call Manager
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