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Interoperability 171

IP Telephony Configuration Guide

Media path redirection

Media path redirection occurs after a call has been established, when an attempt is made to transfer

to or conference in another telephone.

To ensure that call transfers, and conference works correctly, the following rules must be

followed:

• The first preferred codec for VoIP Trunks must be the same on all Business Communications

Managers. (See “Configuring media parameters” on page 85). If this codec is G.729, or G.723,

the Silence Suppression option must be the same on all Business Communications Managers

involved.

• If interworking with a Meridian 1-IPT, the profile on the IPT 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 IPT 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 3.2 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 127

for specific configuration instructions.

Note: Network note: Meridian 1-IPT systems do not support the Radvision gatekeeper.

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Avaya IP Telephony Guía de configuración Pagina 171