After terminal is joined into conference through ISDN line, the connection is great and two-way video/audio transmission is normal. Some time later, high bit error rate(about 90%) occurs on one-way transmission(maybe two-way transmission later), and remote image become freezing or BSOD.
Upgrading the software by special upgrade program which is aimed at “slip” problem can solve this problem.
After software upgrading and “slip” phenomenon emerging, our MCU and terminal receive the fault message and take delay adjustment. “Slip” phenomenon disappears after a few seconds.