this is the dtmf-relay command
mgcp dtmf-relay voip codec {all | low-bit-rate} mode
{cisco | nse | out-of-band}
and this is its details so check up to be comptible with ur pbx
Use the mgcp dtmf-relay command in global configuration mode
to ensure accurate forwarding of digits on compressed codecs.
Use this command to access an announcement server or a voicemail
server that cannot decode RTP packets containing DTMF
digits. When the mgcp dtmf-relay command is active, the DTMF
digits are removed from the voice stream and carried so that the
server can decode the digits.
The following codecs are available:
â– all: Dual-tone multifrequency (DTMF) relay is to be used with
all voice codecs.
â– low-bit-rate: DTMF relay is to be used with only low-bit-rate
voice codecs, such as G.729.
â– cisco: Real-Time Transport Protocol (RTP) digit events are
encoded using a proprietary format similar to Frame Relay
as described in the FRF.11 specification. The events are
transmitted in the same RTP stream as nondigit voice
samples, using payload type 121.
â– nse: Named service event (NSE) RTP digit events are
encoded using the format specified in RFC 2833, Section
3.0, and are transmitted in the same RTP stream as nondigit
voice samples, using the payload type that is configured
using the mgcp tse payload command.
The following modes are available:
â– out-of-band: Media Gateway Control Protocol (MGCP) digit
events are sent using NTFY messages to the call agent,
which plays them on the remote gateway using RQNT
messages with S: (signal playout request).
â– nte-gw: RTP digit events are encoded using the named
telephony event (NTE) format specified in RFC 2833,
Section 3.0, and are transmitted in the same RTP stream as
nondigit voice samples. The payload type is negotiated by
the gateways before use. The configured value for payload
type is presented as the preferred choice at the beginning of
the negotiation.
â– nte-ca: Identical to the nte-gw keyword behavior except that
the call agent's local connection options a: line is used to
enable or disable DTMF relay.
if helpful Rate
