User`s manual

MediaPack SIP User’s Manual 11. Special Applications
Version 4.6 211 June 2005
11 Special Applications
11.1 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
5-27) 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
11-2: 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