Avaya Business Communications Manager 5.0 - Planning and Engineering User Manual Page 181

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Nortel Business Communications Manager 5.0
Planning and Engineering
NN40170-200 01.03 Standard
August 2009
Copyright © 2009 Nortel Networks
VoIP trunk gateway configuration
This section describes how to configure VoIP trunk gateway.
DTMF handling using RFC2833
RFC2833 is an in-band mechanism for DTMF signaling. This feature enables
the BCM SIP gateway to send and receive DTMF using RFC2833.
RFC2833 is the only mechanism for reliable DTMF signaling in SIP. No
standard out-of-band signaling exists. Traditional in-band signaling (DTMF as
a voice) is reliable for G.711 only.
Some limitations and restrictions to this feature apply:
The BCM does not support RFC2833 over H.323 trunks.
IP phones do not support long tones.
Long tones feature is not supported on H.323 trunks.
RFC2833 long tones received from the network are converted into short
tones.
IP phones do not support RFC2833 detection.
SIP trunks do not support military tones A, B, C, and D.
The BCM supports a subset of RFC2833 tones and signals, specifically
DTMF signals for 9, *, and #.
The BCM accepts all three signaling methods (RFC2833, Out Of Band,
DTMF as tone) from SIP endpoints. The sender must choose only one
method for DTMF signaling to prevent digit duplication.
The following path indicates where to set up DTMF handling using RFC2833
in Element Manager:
Element Manager: Configuration > Resources > Telephony
Resources. Select an IP Trunk and click on the SIP Settings tab
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