Its analogous to a human body with no heart beat… no clock? drop calls are rampant… your network would be in chaos… so if synchronization or clocking is present. MOC and Trunk calls would be in error. Call connection would be a major problem, fixed it with attaching or giving your nework with an external clock source. There are equipments there or brands that would be happy to equipt your network with their brand of clock like HP or symmetricom…