Dynamic and Static Jitter Buffers
When gateways detect a data modem, both the originating gateway and the terminating
gateway switch from dynamic jitter buffers to static jitter buffers of 200 ms depth. The
switch from dynamic to static is designed to compensate for PSTN clocking differences
at the originating and terminating gateways. When the modem call is concluded, the
voice ports revert to dynamic jitter buffers.