Chapter 11: Special Applications - Metering Tones Relay - 3Com VCX v7111 User Manual

C 11: S A -
HAPTER PECIAL PPLICATIONS
M T R
ETERING ONES 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:
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3Com VCX V7111 VoIP Gateway User Guide