The values specified in tags, and their attributes below, are a small subset of the potential available values. Depending on the country or network variant these values may change or different ones be preferred. In general this package passes the values unchanged to and from the network, so if any special values must be passed, this is possible without resorting to software changes.
When changing values, both in tags and configuration files, it is important to understand the effect and consequences of the change. For example, it may not always be the best choice to turn off the Charging flag when answering all calls