Cisco EM2-HDA-4FXO - 4-port voice/fax expansion module - FXO Cisco Router Network Module Retail $249.00
HP 0231A53F - MSR 4-port FXO MIM module (MIM-4FXO) - Multifunction Interface Module (MIM) analog trunk interface module with four RJ-45 phone connectors for 2/4 loops of telephone exchanges over data communications networks Retail
