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Provisioning Network Regions
Network regions are Communication Manager constructs for selecting codecs and for grouping
resources by location or network topology. When determining MedPro resources, for example,
Communication Manager will try to select them in the same network region as the IP Telephone
attempting to use them. In addition, codec sets are negotiated by endpoints based on whether
they are in the same or different network regions. It is common to specify G.711 operation within
a network region and G.729 between regions. For voice quality reasons, then, it is advisable to
never have a network region extend across a WAN connection. Thus, when deploying an
IP-Connect system, it is common to have one network region for the central headquarters
location and separate network regions for each remote branch office. MedPros should be
configured for whichever network region in which they are physically located. This concept
applies to VoIP resources on the G700 media gateways, as well. The IP Telephony resources in
a G700 deployed in a branch office should be configured for the network region of the remote
branch office, and not the network region of the MedPros located in headquarters.
QoS
Because G650s can be separated from S8700s by a WAN link, and because network issues
affect G650 stability, it is important to properly enable QoS, specifically DiffServ. QoS is most
important across WAN links, but may be important in LAN environments, as well. If a network
has already been configured for DiffServ, Avaya servers and gateways can utilize the policy
already existing on the network.
Recommendations for QoS DiffServ
If the network has not already been configured for DiffServ, Avaya recommends keeping the
policy simple: set the DiffServ Code Point (DSCP) to 46 (Expedited Forwarding, or EF) for
control, signaling, and voice bearer traffic. Use CBQ or strict priority queuing (with IP Telephony
traffic inserted into the highest priority queue) to offer the appropriate level of service.
Security
Because the S8700 servers have modems for Avaya services access, it is advisable to use an
external firewall or router access-lists to filter traffic to and from the S8700 servers.
lists port ranges used by Avaya products, and can be used to harden a VoIP system.
S8700 IP connect
Access list
Issue 3.4.1 June 2005
345
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