Using a VTL Password 345For more information about how compression affects bandwidth, see“Audio Settings” on page 37.During VTL call setup, the VTL software at each end of the call negotiatesa compression level that is supported by both systems. For example,System A is configured for G729, high compression, and System B isconfigured for G711, no compression. A VTL call between System A andSystem B will use G711, no compression. It does not matter which systeminitiates the call.To enable VTL audio compression:1 Click System-Wide Settings > Audio Settings.2 Click the Audio Compression on VTL Calls check box and then click OK.Enabling SilenceSuppression on VTLCallsYou can enable silence suppression for VTL calls. The default condition isdisabled because silence suppression can compromise audio quality. Formore information about how compression affects bandwidth, see “AudioSettings” on page 37.When you enable VTL silence suppression, the VTL software attempts touse silence suppression on all VTL calls. If the other system is notconfigured to support silence suppression, the local VTL softwareattempts to find a compatible communications mode.Do not enable silence suppression unless you have network congestionproblems you cannot solve otherwise. Enabling silence suppression canreduce network traffic, but the result is a compromise to audio quality.To enable silence suppression on VTLs:1 Click System-Wide Settings > Audio Settings.2 Under VTL Audio Calls Settings, enable the Enable Silence Suppressioncheck box.3 Click OK.Using a VTLPasswordTo allow users on one system to place VTL calls to another system andthen place long-distance (toll) calls from that location (a practice called‘hop off’), you can configure a VTL password.When an system receives a VTL call from a user on another system, it canallow that user to make long-distance calls if the incoming VTL call
