Linksys SPA942 Cisco SPA9000 Voice System Using Setup Wizard Installation and - Page 37

Quality of Service, Local Area Network Design

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Preparation Quality of Service 3 Quality of Service Cisco recommends using the SPA9000 Voice System with QoS-capable networking equipment that can prioritize the VoIP application traffic. QoS features are available on many Cisco data networking switches (such as the SLM224P) and routers (such as WRV200). A QoS-enabled router prioritizes the packets going upstream to the Internet Service Provider. QoS can be enforced using either DSCP (Diffserv Codepoint) ToS (Type of Service) or 802.1 Q/p VLAN ID and priority setting. DSCP ToS is recommended for its simplified setup. Instructions for the SLM224P are provided in this guide. Local Area Network Design Use the following guidelines to manage the LAN setup for the SPA9000 Voice System. • Ensure that all Cisco SPA devices are located in the same local area network subnet. • Although all Cisco SPA devices support static IP addressing, we recommend using a DHCP server to add IP telephones to the system. Ensure that the DHCP server can assign enough IP addresses to serve the Cisco IP phones and the existing networked components such as PCs, servers, and so on. • If you are using DHCP, use a long lease time. Cisco IP phones may reboot on the event of an IP address change because of lease time expiration. • Use stable DNS server addresses for URL name resolution. Your Internet Service Provider can provide the primary and secondary DNS server IP addresses. SPA9000 Voice System Installation and Configuration Guide for Setup Wizard 35

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Preparation
Quality of Service
SPA9000 Voice System Installation and Configuration Guide for Setup Wizard
35
3
Quality of Service
Cisco recommends using the SPA9000 Voice System with QoS-capable
networking equipment that can prioritize the VoIP application traffic. QoS features
are available on many Cisco data networking switches (such as the SLM224P) and
routers (such as WRV200). A QoS-enabled router prioritizes the packets going
upstream to the Internet Service Provider. QoS can be enforced using either DSCP
(Diffserv Codepoint) ToS (Type of Service) or 802.1 Q/p VLAN ID and priority
setting. DSCP ToS is recommended for its simplified setup.
Instructions for the SLM224P are provided in this guide.
Local Area Network Design
Use the following guidelines to manage the LAN setup for the SPA9000 Voice
System.
•
Ensure that all Cisco SPA devices are located in the same local area network
subnet.
•
Although all Cisco SPA devices support static IP addressing, we recommend
using a DHCP server to add IP telephones to the system. Ensure that the DHCP
server can assign enough IP addresses to serve the Cisco IP phones and the
existing networked components such as PCs, servers, and so on.
•
If you are using DHCP, use a long lease time. Cisco IP phones may reboot on the
event of an IP address change because of lease time expiration.
•
Use stable DNS server addresses for URL name resolution. Your Internet
Service Provider can provide the primary and secondary DNS server IP
addresses.