Following constants are available:
| Constant | Value |
|---|---|
| LINE_ADDRESSSTATE | 0 |
| LINE_CALLINFO | 1 |
| LINE_CALLSTATE | 2 |
| LINE_CLOSE | 3 |
| LINE_DEVSPECIFIC | 4 |
| LINE_DEVSPECIFICFEATURE | 5 |
| LINE_GATHERDIGITS | 6 |
| LINE_GENERATE | 7 |
| LINE_LINEDEVSTATE | 8 |
| LINE_MONITORDIGITS | 9 |
| LINE_MONITORMEDIA | 10 |
| LINE_MONITORTONE | 11 |
| LINE_REPLY | 12 |
| LINE_REQUEST | 13 |
| LINE_AGENTSPECIFIC | 21 |
| LINE_AGENTSTATUS | 22 |
| LINE_APPNEWCALL | 23 |
| LINE_PROXYREQUEST | 24 |
| LINE_REMOVE | 25 |