TETRA network configuration

Provide Teltronic API server connection parameters in T.Bridge configuration file:

"ProviderDriver": "teltronic",
"ProviderConfig": {                    
    "UserPrefix": "PT",
    "RootChannelName": "Powertrunk",
    "Groups": [920,921,922,929],
    "Users": [20,21],
    "Host": "172.20.128.100:5063",
    "login_name": "mcip_tassta",
    "password": "tassta",
    "BridgeExternalAddr": "172.20.128.128",
    "BaseRtpPort": 5000,
    "RtpPortCount": 20
}

Parameter	Required	Description
`ProviderDriver`	Yes	Must be `teltronic`.
`UserPrefix`	No	The prefix for bridged users' names shown in TASSTA clients. If omitted, user names will be prepended with "PT".
`RootChannelName`	No	The base channel name for the bridged TETRA system. This channel will appear in TASSTA network when T.Bridge is running. All channels from the bridged network will be presented as sub-channels. If omitted, the base channel will be named "Powertrunk".
`Groups`	Yes	A list of bridged groups, an array of GSSI's. Only the groups from this list are available in TASSTA network.
`Users`	Yes	A list of bridged radios, an array of ISSI's. Only the radios from this list are available in TASSTA network.
`Host`	Yes	IP address and the port number of the Teltronic API server.
`login_name`	Yes	Username for accessing the Teltronic API server.
`password`	Yes	Password for accessing the Teltronic API server.
`BridgeExternalAddr`	Yes	IP address of the computer running T.Bridge.
`BaseRtpPort`	Yes	The starting port number used by T.Bridge to receive RTP.
`RtpPortCount`	Yes	The total number of RTP ports.