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Page 98 - Part 2 Voice Over IP How Do I?
Configuration
The following configuration task list details the necessary steps to enable QoS
configuration and IPNC systems. QoS interoperation with Third party router relies
on the successful negotiation of the PPP protocol options.
Task Description
Step 1
Configure the IPNC link to provide the
appropriate IP connectivity
Several examples of IP connectivity options are
detailed in the preceding chapters.
Step 2
On the PPP tab of the service configured in the
previous step select the following configuration
Items.
• Header Compression Mode using IPHC
• Multilink
This is not required in the case were the IPNC
forward VoIP over a LAN.
See the PPP tab on page 55.
Step 3
On the WAN port form (see page 56) configure
the operational speed of the WAN link in bits/per
second.
E.g.
Speed = 128000
IPNC uses the configured WAN speed to
dynamically calculate PPP link fragment size for
non-voice traffic.
QoS interoperation with 3
rd
Party routers
IPNC 3.2 software has the following operating characteristics
Description Value
Voice UDP port numbers range 0xC000 to 0xCFFF
Signalling TCP port number 1720
DSCP (TOS/Diffserv) value 0xA0
The “enabling protocols” for low speed WAN links is the PPP options for IP
Header Compression (RFC 2508) and PPP Multilink (RFC1990). As long as
these options are agreed on the PPP link then each router can “locally” apply
QoS to their respective end of the link.
The DSCP value is configured on the system/gatekeeper tab and the PPP
multilink and IPHC option is configurable under the Service/PPP tab.
Step 4 - Test IP Connectivity
The IPNC Monitor Tool is a powerful debugging and diagnostic tool. Using the
IPNC System Monitor application options, it is possible to debug all aspects of
the IPNC's functions and features. Generally, outputs are associated directly to
any related standard. E.g. PPP monitor outputs will reference RFC terms relating
to the PPP protocol.
The section IPNC debugging contains details on further monitor options useful for
debugging QoS, call setup and protocol negotiations issues on IPNC.
Page 98 - How Do I? INDeX IPNC Cassette Administration Manual
Part 2 Voice Over IP 38DHB0002UKDD – Issue 7 (22/11/02)