MP-1xx SIP User’s Manual 8. Gateway Capabilities Description
Version 4.4 159 March 2005
8.8 Metering Tones Relay
The MP-1xx FXS and FXO gateways can be used to relay standard 12 or 16 kHz metering tones
over the IP network as illustrated in Figure
8-1 below.
Figure
8-1: 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
8-2). The FXS gateway generates the same pulses to the connected phone.
The parameter ‘MeteringType’ (described in Table
5-26) 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 file
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
8-2: Proprietary Info Message for Relaying Metering Tones
INFO sip:108@10.13.83.1 SIP/2.0
Via: SIP/2.0/UDP 10.13.83.2;branch=z9hG4bKacEizRjAa
Max-Forwards: 70
From: "aviad" <sip:201@10.13.83.2>;tag=1c1638621413
To: <sip:108@10.13.83.1;user=phone>;tag=1c1412617336
Call-ID: 2031013892fcCd@10.13.83.2
CSeq: 3 INFO
Contact: <sip:201@10.13.83.2>
Supported: em,timer,replaces,path
Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE
User-Agent: Audiocodes-Sip-Gateway-MP-104 FXS/v.4.40.0.18700
Content-Type: message/Metering
Content-Length: 0
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