3Com
®
VCX V7111 VoIP Gateway User Guide
317
C
HAPTER
11:
S
PECIAL
A
PPLICATIONS
-
M
ETERING
T
ONES
R
ELAY
The V7111 FXS and FXO gateways can be used to relay standard 12 or 16 kHz metering
tones over the IP network.
Figure 118
Metering Tone Relay Architecture
After a call is established between the FXS and FXO gateways, the PSTN generates 12 or
16 kHz metering tones towards the FXO gateway. The FXO gateway detects these pulses
and relays them, over IP, to the FXS gateway using a proprietary INFO messages (shown in
Figure 119
). The FXS gateway generates the same pulses to the connected phone.
The parameter MeteringType (described in
Table 49
) is used to determine the frequency of
the metering tone (12 kHz (default) or 16 kHz). In addition, the correct (12 or 16 kHz)
coefficient must be used for both FXS and FXO gateways.
To enable this feature configure SendMetering2IP = 1.
The proprietary INFO message used to relay the metering tone pulse contains a Content-
Type: message/Metering:
Summary of Contents for VCX V7111
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