Accumulated tx/rx bytes and packet number per sip client.

Summed (for sip client) values of rxpkts, txpkts, rxbytes, txbytes available in response to ubus call:

ubus call asterisk call_status '{ "line" : X }'

Response:

{
	"line": 1,
	"call_status": "Idle",
	"stats": {
		"RTP": {
			"PacketsReceived": 196,
			"PacketsSent": 356,
			"BytesReceived": 33960,
			"BytesSent": 56712
		}
	}
}