I am trying to assist users in setting up external call forwarding to cell phones via a Norstar MICS with system software 5.0 and another running 4.1. The latter uses PRI for outbound trunks and the former BRIs. Routing is set up properly and the external call forward can be applied to a phone, but we find that while forward to land lines works fine, forward to a cell phone consistently results in a dropped call once it dials the cell number. A fast busy signal is usually received by the caller. Are there signaling differences/limitations between ISDN circuits and cell phone lines that create this condition? A detailed technical explanation would be appreciated. Thanks.
18 years ago