SIP Error: 415 Unsupported Media Type

This error means that none of the SIP codecs selected is supported by your VOIP service or PBX system. A codec is used to encode and decode audio streams.

To correct this problem, open Voicent gateway, select Setup > Options > SIP, then click the Codec Setup… button.

Normally, you should keep the default selections: gsm, ilbc, pcma, pcmu. The codecs are used to inform the VOIP service or PBX system the preferred codecs of Voicent software. And the service will choose one of the codec and use it to communicate with Voicent gateway.