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While operating yate as ISDN soft-switch in the Osmocom OCTOI network, we observed that there are plenty of drop-outs in the B-channels leading to massive PRBS failures. Comparison with asterisk, freeswitch and other DAHDI using applications showed that they all use DAHDI_POLICY_WHEN_FULL and differently-sized buffers. When making yate use the same buffer sizes + policy, the PRBS errors were gone.