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Using Enterprise Edge Services 33
P0910464 Issue 01 Enterprise Edge Networking Operations Guide
As a reference point: for a typical G.729 codec, each VoIP flow requires the
following WAN bandwidth, depending on the codec sample rate:
Note: The calculation is based on a full-duplex WAN link with HDLC overhead
and VoIP with silence suppression.
Nortel Networks recommends that for slow WAN links, such as a 56K leased line
or ISDN, H.323 video is not configured as premium traffic.
Packet Marking for DiffServ Networks
Enterprise Edge classifies traffic and marks packets by setting the IP header type of
service (TOS) field. By default, the following items are classified as premium
traffic:
All VoIP flows
RIP packets: routing packets are periodically exchanged between Enterprise
Edge and remote routers. These packets need higher priority than regular
packets to ensure that the routing protocol is working properly.
ICMP packets: Enterprise Edge Net Link Manager uses the ‘ping’ command to
decide whether the primary WAN link is active or inactive. These packets are
not delayed by regular packets.
UDP Port 5000 packets – Enterprise Edge VoIP QoS Monitor uses port 5000 in
a proprietary protocol to monitor the IP network delay and jitter. Since
Enterprise Edge assigns VoIP packets to the premium queue, it also gives these
monitor packets high traveling priority.
Admitted RTP/RTCP packets.
In Enterprise Edge, there are two places a user can set up a TOS field in an IP
header:
TOS-for-Premium-Traffic – this field sets TOS bits for premium packets for
DiffServ networks. If this field is ignored, Enterprise Edge uses a default value
of 0xB8.
TOS-for-Priority-Filters– this field sets TOS for those packets matching a
specific priority filter.
Note: You can specify packets matched to a filter to go Priority Queue 0 – 8. The
Queue 0 is for premium packets, and Queue 1 – 8 correspond to best-effort
priority classes 1 – 8.
G.729 Sample Rate
30 ms
Sample Rate
20 ms
Sample Rate
10 ms
No
Compression
10.6 k 14 k 24 k
Data
Compression
8 k 10 k 16 k
RTP Hdr Comp. 5.8 k 6.8 k 9.6 k
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