I have a MICS XC 7.0 with several LSDS cards used for outgoing calls. There is also an analog DID card used for incoming DID calls. There are only 4 analog incoming trunks on this system, and they are getting too many busy signals.

I would like to remove the DID card and install a DTI for PRI, along with service from the telco. This system has two 6 port fiber expansion cards in the main cabinet, and they are all used. Mostly MOX16, MOX8A and M12X0 for the outgoing loop start lines.

I can install a DTI card in slot 4 of the main cabinet, along with the proper key codes. I think I also need a Services Cartridge for timing, but I'm out of slots. What options do I have? Must I have the Services Cartridge?

Thanks.
Jim