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SX20 with a ISDN box

 I have an outstation using an SX20 with an ISDN link. It goes through an external crypto device. When calling direct for on ISDN kit to another there is no issue and the picture and video are good. When I dial from the MCU/ISDN GW on 128k it connects for a few seconds then ends the call. When dialling out on 64k the call connects but I receive no video only audio.

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