add_channel_features

Add features to the desired features to be prepared on Channel objects.

Those features will be added to the features already returned be dup_channel_features.

It is not necessary to add TP_CHANNEL_FEATURE_CORE as it is already included by default.

Note that these features will not be added to existing Channel objects; the user must call prepare_async themself.

Parameters:

this	a SimpleClientFactory object
features	an array of desired features, ending with 0; null is equivalent to an array containing only 0