3Com VCX v7111 User Manual page 318

Figure 119 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,UPDAT
E
User-Agent: 3Com-Sip-Gateway-V7111 14 PORT FXS/v.4.40.0.18700
Content-Type: message/Metering
Content-Length: 0
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3Com VCX V7111 VoIP Gateway User Guide