Avaya IP Telephony Guía de configuración descargar pdf (Pagina 144)

144 Interoperability

P0993474 03

Speech path setup methods

Business Communications Manager 3.0 currently initiates calls using H.323 fastStart methods.

The Business Communications Manager 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 3.0 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 media parameters” on page 74). If this codec is G.729, or G.723,

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

involved.

Echo cancellation 48 ms tail delay

In-band signaling DTMF (TIA 464B)

Call progress

Speech path setup methods Call Initiator:

• H.323 fastStart

Call Terminator:

• H.323 slowStart

• H.323v2 fastStart

End-to-end DTMF signaling digits 0-9, # and *, fixed-duration tones only

Table 34 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

Table 33 Engineering specifications

Capacity 1 to 8 ports

1 2 ... 139 140 141 142 143 144 145 146 147 148 149 ... 179 180

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Avaya IP Telephony Guía de configuración Pagina 144