External call forward to cell phone over PRI/BRI

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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.



Re: External call forward to cell phone over PRI/BRI


Just a follow-up...

On the BRI based 5.0 system, external call forward to cell phones using
full 10 digit number works, i.e. 91415xxxxxxx works where 9xxxxxxx
doesn't.

On the PRI system this does not change anything when forwarding to
certain cell carriers, like Verizon. It can be forwarded to a Cingular
based phone however. In fact, a call to that (Cingular) fowarded phone
cannot be placed from a Verizon cell phone, but landlines and others
worked. There seems to be no rhyme or reason to what works and what
doesn't.



Re: External call forward to cell phone over PRI/BRI


bignasty2009 had written this in response to
http://forums.cabling-design.com/nortel/Re-External-call-forward-to-cell-phone-over-PRI-BRI-754-.htm
 :


-------------------------------------
BR wrote:




Quoted text here. Click to load it





Did u ever get an answer for this? did u need some sort of GSM gateway? I
am the same problem and I
am guessing it is because of the different protocols.



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