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Avaya BCM 2.0 IP Telephony Manual de usuario Pagina 72

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72 Interoperability
Enterprise Edge 2.0 IP Telephony Configuration Guide P0911590 Issue 02
Asymmetrical media channel negotiation
By default, the Enterprise Edge IP Telephony gateway supports G.729, G.723.1,
G.711 µ-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. Enterprise Edge 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. The party on the Enterprise Edge switch hears a treatment from the switch
(normally a reorder tone). The party on the NetMeeting client losses 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 Enterprise Edge local gateway
configuration table. Table 17 lists the names used by the Enterprise Edge local
gateway table and the matching names in NetMeeting.
Table 17 Name comparison
No feedback busy station
The Enterprise Edge VoIP gateway considers the voice over IP connection as the
equivalent of an MF trunk. The Enterprise Edge VoIP gateway provides call
progress tones in-band to the user. On calling a busy station through the gateway,
the gateway plays a busy tone to the user. As NetMeeting does not support fastStart,
no speech path is opened to the user before the call connects. In this distinct design,
the user on the NetMeeting station does not hear a busy signal from the gateway.
Enterprise Edge local gateway 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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