At one of our sites we have an IPO 500v2 running 8.1(52). There are 2 PRIs for PSTN connectivity. There are several people that are out of the office frequently and would like to twin to their cell phones. I went to the mobility tab under the user and checked "Mobility Features" and "Mobile Twinning". I filled out the box for the cell number and prefaced it with a 9. Saved and sent to the box and it doesn't work. Did I miss something? Thanks!

Watch SSA to see what is happening woth th ecall.

Also, in the SYSTEM tab under mobility, is teh box checked to send originator calling party ID?
If it is, try unchecking (might be a reboot). If the call works, then your carrier is not allowing you to send the originating callers Caller ID, so when it trys, the carrier refuses the connection.

Thanks Mongo. It does appear to fail with the LEC. I have a call into them to work with a switchman.