Geographic location identification of the Agent, either GPS coordinates or the serving cell identification of the Agent's wireless modem (Location Area). If the Agent has a GPS receiver the GPS coordinates should be responded, otherwise the LA. If neither the GPS coordinates nor the LA is known to the Agent, an empty string should be responded. This location id is always a comma separated string. Syntax for GPS coordinates: 'GPS,<latitude>,<longitude>' <latitude>: numeric value (decimal), positive value for north, negative for south, including a decimal point. Allowed characters '-','0'..'9','.' <longitude>: numeric value (decimal), positive value for east, negative for west, including a decimal point. Allowed characters '-','0'..'9','.' E.g. 'GPS,42.4088172912598,-71.1735153198242', 'GPS,-1.2,12.34' Syntax for LA: 'LA,<mcc>,<mnc>,<lac>,<ci>' <mcc>: mobile country code, allowed characters '0'..'9' <mnc>: mobile network code, allowed characters '0'..'9' <lac>: location area code (decimal), allowed characters '0'..'9' <ci>: cell identity (decimal), allowed characters '0'..'9' If any value is unknown, it has to be left empty but the corresponding comma has to be provided. E.g. 'LA,123,12,67890,1234', 'LA,321,21,456,'