A leaky fuel injector can also cause backfire.   If the backfire is from the air intake (air cleaner), then that tells us that a very lean air/fuel ratio condition exists. The mixture explodes in the intake manifold instead of in the combustion chamber.
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Polycom VVX 400 and 410 Business Media Phones User Guide Version 5.0.0 Polycom, Inc. 14 In Lines view, you can press a line key to access the Dialer and view the number of active or held calls on your phone, as shown below. In Lines view, the phone line indicates the number active and held calls on your line.olycom VVX 400 and 410 Business Media Phones User Guide Version 5.0.0 Polycom, Inc. 20 3 From the Web Configuration Utility login screen, select User, enter the user password, and click Submit. The default user password is 123. The Web Configuration Utility Home screen is displayed.