[Asterisk-Dev] ISDN PRI and E1

[Anik Gupta]

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Hi ,
 
            I  have a Siemens HICOM 350H PBX system with 500 lines . I  want to buy another PBX system which is IP enabled and tie both of these in order to have a total of 1000 lines . One of the options is through ISDN line and the other through Fiber optic cable.
 
what would be the hardware required on both the ends for the purpose.
 
regards
 
anik