AudioCodes MP-1FXO Bedienungsanleitung Seite 277

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SIP User's Manual 11. Special Applications - Metering Tones Relay
Version 5.0 277 December 2006
11 Special Applications - Metering Tones
Relay
The MediaPack FXS and FXO gateways can be used to relay standard 12 or 16 kHz
metering tones over the IP network as illustrated in Figure 11-1 below.
Figure 11-1: 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 11-2). The FXS gateway generates the same pulses to the connected phone.
The parameter ‘MeteringType’ (described in Table 5-35) 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’:
Figure 11-2: Proprietary INFO Message for Relaying Metering Tones
INFO sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 10.13.83.2;branch=z9hG4bKacEizRjAa
Max-Forwards: 70
From: "aviad" <sip:[email protected]>;tag=1c1638621413
To: <sip:[email protected];user=phone>;tag=1c1412617336
CSeq: 3 INFO
Contact: <sip:[email protected]>
Supported: em,timer,replaces,path
Allow:
REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE
User-Agent: Audiocodes-Sip-Gateway-MP-114 FXS/v.4.40.0.18700
Content-Type: message/Metering
Content-Length: 0
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