Currently the following codecs can be used with the sip.audio SIP-Server, used by ipDTL:

• OPUS Audio only as Stereo
• OPUS Low Delay
• OPUS Voice
• G722

ipDTL has a nice manual for connecting LUCI using SIP.

You can find it here: ipDTL LuciLive SIP Instructions

Or watch their video: https://www.youtube.com/watch?v=6E7hic_CN0Q

For LUCI LIVE Lite it’s a bit different as you can only use the G722 codec:Luci Live Lite SIP Instructions