You can use this option to check the capabilities provided by the cell phone provider. Currently, Avaya recommends the default value of n. The downside of Fast Connect is that there is no indication to the caller of when the far-end has actually answered. The billing of the call starts immediately after the call setup. If billing is involved, then do not select the Fast Connect option. However, all digits required to route the call must be passed in the SETUP message. DECT XMOBILE stations always use Fast Connect. Whereas, PHS XMOBILE and EC500 XMOBILE/OPTIM stations never use Fast Connect. SIP phones do not block blind conference if the Fast Connect option is enabled.