Snom D735 User Manual page 8

5. On the [Setup] options, select [Identity 1], then click [RTP].
Codec : Enter [pcmu,telephone-event].
* If you use our call center system, CTI, please select "off" for RTP Encryption
*Click [Save] to save changes.
6. On the [Setup] options, select [Preferences].
Web Interface Language: Select [English].
Language: Select [English].
*Click [Save] to save changes
*
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