Value,Description,Reference
7,(OCRQ) Outgoing-Call-Request,
8,(OCRP) Outgoing-Call-Reply,
9,(OCCN) Outgoing-Call-Connected,
10,(ICRQ) Incoming-Call-Request,
11,(ICRP) Incoming-Call-Reply,
12,(ICCN) Incoming-Call-Connected,
13,(reserved),
14,(CDN) Call-Disconnect-Notify,