v1.8.x incoming fax detection on IAX2 channel?

From all of the documentation, I can only see that v1.8.x supports fax detection for SIP and DAHDI channels. On v.1.4.x, I used NVFaxDetect to do fax detection on IAX2 channels, but the developer indicates this is no longer required with v.1.8.x.

Can anyone confirm/verify whether v1.8.x has incoming fax detection for IAX2? If it doesn’t exist, any other suggestions?