Dear ikka Thanks, well the best way is by SIP to E1 ISDN gateway (could use Digium, Audiocodes, Sangoma, etc.). But should contemplated on KX-TDA600 ISDN PRI card KX-TDA0290 and configure as QSIG signalling. I don't recommend to use ATA FXS converter, first problem you couldn't dial to any extension to KX-TDA600, PBX answer incoming call from analogue line through Voice mail configured as Automated attendant, or DISA card. The other point is line attenuation.
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