# Configuring TDD/TTY

Use the following procedure to configure the Tele Type (TTY)/Telephone Device for the Deaf (TDD) mode on Communication Manager for use in Avaya one-X Agent:

1. Log on to Communication Manager to gain access to the Communication Manager administration interface.

   Alternatively, you can use Station Administration Terminal (SAT) to gain access to the Communication Manager administration interface.

2. Run the command: change ip-codec-set 1<codec set number of your network region>, for example, change ip-codec-set 1.
3. On the administration screen, in the TDD/TTY field, perform one of the followings steps:

   - To set TDD/TTY to run in the US (45.45 baud) format, select `US`.

   - To set TDD/TTY to run in the UK (50 baud) format, select `UK`.

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