Manufacturer Part Number: L30251-U600-A312, S30810-Q2929-X Analog Subscriber Line Module (24 a/b) SLA24N for HiPath 3550 large installation space no CLIP support for connection of analog phones Fax, answering machines Speakers Doorphone-Amplifiers Announcement devices VoiceMail external music source Large assembly in HiPath 3550 can only be used in slot 10 Update End of HiPath 3550 modules SLA24N L30251-U600-A312 (S30810-Q2929-X) As part of the product phase-out of HiPath 3000 V4 and HiPath 37x0 hardware was phased out . The above HiPath 37x0 assemblies were still over a longer period (2005 - present) for the large built-in slot in the HiPath 3550 used and produced.