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Updates to Cisco AS5300 Universal Access Server Module Installation and Software Configuration Guides 15
DTMF-Relay
The dtmf-relay command specifies how an H.323 gateway relays DTMF tones between telephony
interfaces and an IP network. Options allow the gateway to forward tones as part of the signal or as
part of an H.245 control channel. The no form of this command removes all signaling options and
transmits the DTMF tones as part of the audio stream.
dtmf-relay [cisco-rtp] [h245-signal] [h245-alphanumeric]
no dtmf-relay
Syntax Description
The DTMF-relay syntax is as follows:
• Configuring with DTMF-relay cisco-rtp or h245-signal when sending to dial-peer 103. Enter the
configuration commands, one per line.
5300# conf t
5300(config)# dial-peer voice 103 voip
5300(config-dial-peer)# dtmf-relay cisco-rtp h245-signal
5300(config-dial-peer)# end
5300#
• Configuring the gateway to send DTMF inband (the default) when sending to dial-peer 103.
Enter the configuration commands, one per line.
5300# conf t
5300(config)# dial-peer voice 103 voip
5300(config-dial-peer)# no dtmf-relay
5300(config-dial-peer)# end
The dtmf-relay command determines the outgoing format of relayed DTMF tones. The gateway
automatically accepts all formats.
The gateway only sends DTMF tones in the format you specify if the remote device supports it. If
the remote device supports multiple formats, the gateway chooses the format based on the following
priority:
1 cisco-rtp (highest priority)
2 h245-signal
3 h245-alphanumeric
4 None – DTMF sent inband
cisco-rtp (Optional) Forwards DTMF tones using RTP protocol with a Cisco proprietary
payload type.
h245-signal (Optional) Forwards DTMF tones using the H.245 “signal” User Input Indication
method. Supports tones 0-9, *, #, and A-D.
h245-alphanumeric (Optional) Forwards DTMF tones using the H.245 “alphanumeric” User Input
Indication method. Supports tones 0-9, *, #, and A-D.