Avaya IP Telephony Konfigurationsanleitung Seite 120

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120 Interoperability
P0937663 03.1
Speech path setup methods
Business Communications Manager 2.5 currently only initiates calls using H.323 slowStart
methods. The Business Communications Manager, however, will accept and set up calls that have
been initiated by another endpoint using H.323v2 fastStart methods, as well as H.323 slowStart
methods.
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. Business Communications Manager 2.5 does not support
codec re-negotiation upon media path redirection.
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 codecs on page 60). 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-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 any H.323v2 gatekeeper,
with the Business Communications Manager supporting 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.
Table 18 Supported voice payload sizes
Codec Receive/transmit to M1-ITG Receive/transmit to others
G.711 Highest supported by both ends, up to 30
ms in 10 ms increments.
20 ms
G.723.1 30 ms 30 ms
G.729 Highest supported by both ends, up to 30
ms in 10 ms increments.
20 ms
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