Avaya IP Telephony Guia de Configuração descarregar pdf (Página 145)

Interoperability 145

IP Telephony Configuration Guide

• If interworking with a Meridian 1-ITG, the profile on the Internet Telephony Gateway (ITG)

must be set to have the same first preferred codec as on the Business Communications

Manager, the Voice Activity Detection (VAD) option must be set to the same value as the

Silence Suppression on the Business Communications Manager and the ITG payload size

must be set to 30 ms. If these rules are not adhered to, simple calls will still go through, but

some transfer scenarios will fail.

Gatekeeper

The Business Communications Manager is designed to interoperate with Radvision ECS 2.1.0.1

and CSE 1000 gatekeepers. As part of this, the Business Communications Manager supports both

Direct (GatekeeperResolved) and Routed (GatekeeperRouted) call signaling in this mode of

operation. Note that if the call signaling method is changed, the Business Communications

Manager must be restarted before it functions properly. Refer to “Using a gatekeeper” on page 103

for specific configuration instructions.

Asymmetrical media channel negotiation

By default, the Business Communications Manager IP Telephony gateway supports the G.729

codec family, G.723.1, G.711 mu-law and G.711 A-law audio media encoding. Because

NetMeeting does not support the H.323 fastStart call setup method, NetMeeting can choose a

different media type for its receive and transmit channels. However, Business Communications

Manager IP Telephony gateway does not support calls with different media types for the receive

and transmit channels and immediately hangs up a call taken with asymmetric audio channels. In

this case, the party on the Business Communications Manager switch hears a treatment from the

switch (normally a reorder tone). The party on the NetMeeting client loses connection.

To solve this problem, in NetMeeting, under the Tools, Options, Audio, Advanced, check

Manually configure compression settings, and ensure that the media types are in the same order

as shown in the Business Communications Manager media parameters table. The following table

lists the names used by the Business Communications Manager local gateway table and the

matching names in NetMeeting.

Table 35 Name comparison

Business Communications Manager media

parameters table MS NetMeeting

G.723.1 6.3 Kbit/s MS G.723 6400 bit/s

G.723.1 5.3 Kbit/s MS G.723 5333 bit/s

G.711

µ-law CCITT µ-law

G.711 A-law CCITT A-law

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Avaya IP Telephony Guia de Configuração Página 145