Default sample rate for Opus in SNG7

When selecting Opus as the main codec in SIP settings for SNG7, what is the sample rate used, 8kHz narrowband or 16kHz wideband?

If Opus can be either narrowband or wideband in SNG7 (and maybe super-wideband too), then several options should be selectable in SIP settings.
This is what e.g. Zoiper is doing: