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# Telephony Service
## Overview
Telephony service allows respective clients access to the Handsfree Profile via the oFono package
## Verbs
| Name | Description | JSON Response |
|---------------------|-------------------------------------------------|---------------------------------------------|
| subscribe | subscribe to telephony events | *Request:* {"value": "callStateChanged"} |
| unsubscribe | unsubscribe to telephony events | *Request:* {"value": "callStateChanged"} |
| dial | dial respective number | *Request:* {"value": "15035551212"} |
| send_tones | send tone through the active call | *Request:* {"value": "1"} |
| hangup | hangup an active call or reject incoming call | |
| answer | answer incoming call | |
| get_battery_level | getting battery level of connected phone device | |
| get_network_registration | getting network registration of connected phone device | *Response:* {"Status": "registered","Mode": "auto-only","Name": "Irancell","Strength": 20} |
## Events
| Name | Description | JSON Event Data |
|---------------------|-----------------------------------------|---------------------------------------------|
| callStateChanged | Call status change event | see callStateChanged event |
| dialingCall | Outgoing call events | {"colp": "3305551212"} |
| incomingCall | Incoming call events | {"clip": "3305551212"} |
| terminatedCall | Terminated call event | *empty JSON response* |
| online | Connected status of Handsfree Profile | {"connected": true} |
| battery | Connected status of Handsfree Profile | {"battery level": 2} |
| signal | Connected status of Handsfree Profile | {"signal level": 20} |
### callStateChanged Event
This event has one field called *parameter* with one of the following states (see **doc/voicecall-api.txt** in oFono for further reference):
| Name | Description |
|----------------|-----------------------------------|
| active | Call is active |
| held | Call is on hold |
| dialing | Call is being dialed |
| alerting | Remote party is being alerted |
| incoming | Incoming call in progress |
| waiting | Call is waiting |
| disconnected | Call is disconnected |
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