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 |
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Step 1 |
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Configure the IPNC link to provide the |
| Several examples of IP connectivity options are |
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appropriate IP connectivity |
| detailed in the preceding chapters. |
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Step 2 |
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On the PPP tab of the service configured in the |
| This is not required in the case were the IPNC |
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previous step select the following configuration |
| forward VoIP over a LAN. |
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Items. |
| See the PPP tab on page 55. |
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• Header Compression Mode using IPHC |
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• Multilink |
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Step 3 |
| IPNC uses the configured WAN speed to |
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On the WAN port form (see page 56) configure |
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the operational speed of the WAN link in bits/per |
| dynamically calculate PPP link fragment size for |
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second. |
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E.g. |
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Speed = 128000 |
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QoS interoperation with 3rd 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) |
