Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 98)

Chapter 4 Gateway Selection

DTMF Relay

4-4

Cisco IP Telephony Network Design Guide

78-11103-03

Skinny Gateways

The Cisco Access Digital Trunk Gateway DT-24+, the Cisco Access Digital

Trunk Gateway DE-30+, and the Catalyst 6000 gateway use the Skinny Gateway

Protocol to carry DTMF signals out of band using the TCP port 2002. Out-of-band

DTMF is the default gateway configuration mode.

Cisco IOS H.323 Gateways

The Cisco 1750, 2600, 3600, 7200, and AS5300 series products communicate

with Cisco CallManager using H.323. Both Cisco CallManager Release 3.0(5)

and Cisco IOS Release 12.0(7)T include the enhanced H.245 capability for

exchanging DTMF signals out of band. The following example shows

out-of-band DTMF configuration on an Cisco IOS gateway.

dial-peer voice 100 voip

destination-pattern 555….

session target ipv4:10.1.1.1

codec g729ar8

dtmf-relay h245-alphanumeric

preference 0

Note Due to memory limitations on the TI542 DSP used on the previous

Cisco 3810 version, only the Cisco 3810 V3 with the new voice

compression module supports H.245 DTMF relay.

MGCP Gateway

The VG200 communicates with Cisco CallManager using MGCP. MGCP uses the

concept of “packages.” The VG200 loads the DTMF package upon startup. Once

the out-of-band DTMF capabilities are configured in the Cisco CallManager

MGCP gateway user interface, the VG200 sends “symbols” over the User

Datagram Protocol (UDP) control channel to represent any DTMF tones it

receives. Cisco CallManager interprets these symbols and passes on the DTMF

signals, out of band, to the signaling endpoint. The global configuration command

for DTMF relay on the VG200 is

mgcp dtmf-relay codec all mode out-of-band

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 98