Avaya 38DHB0002UKDD manual Configure IP Connectivity, IP Connectivity Options, LAN 10/100 Ethernet

How Do I?Part 2 Voice Over IP - Page 97

Step 3 - Configure IP Connectivity

Configure the IPNC for the appropriate IP connectivity option.

IP Connectivity Options

LAN 10/100 Ethernet

The IPNC transmitted VoIP packets to LAN are distinguish with the TOS field setting. In this case it would be the function of other systems on the LAN to ensure that voice traffic is protected from delay.

Lease line (PPP)

Avaya QoS for Slow Speed WAN links ensure that non-voice traffic does not adversely affect the delay sensitive VoIP stream. The Avaya QoS can also be configured to interoperate with a 3rd party router over a WAN link.

Frame Relay

Using Frame Relay with PPP encapsulation it is possible to provide VoIP over

Frame Relay between two INDeX systems.

Digital services

The term Digital service to refers to QSIG, DPNSS ISDN-ePRI, ISDN-2e. The IPNC can be configured to provide VoIP over single or multiple (bundled) bearer channels. A single ISDN bearer channel, for example, can be used to support up to 5 concurrent VoIP calls. The bandwidth of a G711 VoIP call is equal to the bandwidth of a single bearer channel. Hence G711 compression is not supported for this connectivity type.

QoS

Operation

The diagram below illustrates the operation of Avaya’s IPNC QoS mechanism for slow speed WAN links.

VPN Line

Voice

V3 V2 V1

Non-Voice

D1

Header Comp.

Voice

Traffic &

Signalling

Normal

Compressed

Signalling

Multilink

Non-Voice

D1-2

V2

D1-1

V1

Router	IP Header	Interface	Multilink	PPP Link
	Compression		Fragmentation

Voice packets are transmitted with a fixed length and intervals (1x20ms) and must not be delayed through the interface.

The illustration shows voice packets (V1, V2 and V3) and non-voice packet D1 arriving at the PPP interface. The non-voice packet D1 is made to fit into the interval between successive voice packets. This is accomplished by processing large non-voice packets through PPP Multilink. The Multilink process “fragments” the larger non-voice packet (D1) into smaller components (D1-1 and D1-2) for serialization to the PPP link. Voice packets are not fragmented in this way. Layer 3 (call control) packets are fragmented and inserted when bandwidth is available in the same way as non-voice packets.

INDeX IPNC Cassette Administration Manual	How Do I? - Page 97
38DHB0002UKDD – Issue 7 (22/11/02)	Part 2 Voice Over IP