# Transmission

> Learn how transmission changed in the upgrade.

Various functions in the VivoxVoiceChat module are replaced by the functionality of Transmission. For code examples and usage notes, see [Transmission](../transmission/transmission-overview).

The following list provides the name of the function in the VivoxVoiceChat module, the comparable function in VivoxCore, and supplemental information for completing a version switch.

* `TransmitToAllChannels()` is replaced by `SetTransmissionMode(TransmissionMode::All)`

  * Calling ILoginSession::SetTransmissionMode(TransmissionMode::All) on an ILoginSession causes it to transmit to all connected channels.

* `TransmitToNoChannels()` is replaced by `SetTransmissionMode(TransmissionMode::None)`

  * Calling ILoginSession::SetTransmissionMode(TransmissionMode::None) stops the ILoginSession from transmitting to any channel.

* `TransmitToSpecificChannel()` is replaced by `SetTransmissionMode(TransmissionMode::Single, ChannelId singleChannel)`

  * Calling ILoginSession::SetTransmissionMode(TransmissionMode::Single, ChannelId singleChannel) with TransmissionMode::Single and a ChannelId that the ILoginSession is connected to makes it transmit to that channel.

* `GetTransmitMode()` is replaced by `GetTransmissionMode()`

  * Calling ILoginSession::GetTransmissionMode() on an ILoginSession returns the TransmissionMode that the ILoginSession is currently in.

* `GetTransmitChannel()` is replaced by `GetTransmittingChannels(), IsTransmitting()`

  * Calling ILoginSession::GetTransmittingChannels() on an ILoginSession returns an array of all ChannelIds that the login session is transmitting to. You can also call IChannelSession::IsTransmitting() on a specific IChannelSession to see if it is currently being transmitted into.