Answer by taking a quote from the following article:

CBC Radio 3 is a radio network that consists of two parts devoted to Canadian arts and music: a radio service which is available on Sirius XM Satellite Radio and streaming audio, and several daily and weekly podcasts from the CBC Radio 3 website. The audio stream is available from both CBC Music and from iTunes Radio, but geographical restrictions are in place to prevent access outside of Canada. The network evolved out of programming on CBC Radio 2, which also simulcasted the satellite network on Saturday and Sunday nights from its debut in December 2005 until March 17, 2007. Radio 3 is no longer heard on terrestrial radio, but is still available through its satellite radio and Internet operations.

From 2005 to 2009, the Icecast stream available from the network's website was not a simulcast of the satellite radio broadcast, but was programmed separately. Initially, the webstream consisted exclusively of music with the occasional identification break, but on September 14, 2007 it was relaunched with hosts and feature content, similar to but still programmed separately from the satellite radio station. Due to funding cuts, however, the two services were merged in June 2009, such that the webstream is now a straight simulcast of the satellite radio channel.  Prior to the merger, the two services had slightly different programming strategies - the satellite radio station aired a music mix of 85 per cent Canadian and 15 per cent international, while the web service's mix was 100 per cent Canadian. With the merger of the two services, the station announced that the program mix would be 100 per cent Canadian music on both platforms, although exceptions will be permitted for international music with some Canadian character - such as international artists covering Canadian songs, collaborations between Canadian and non-Canadian artists, international artists appearing on the bill with Canadian artists when the network is airing a live concert, or "honourary [sic] Canadian" artists such as Neko Case and Rose Melberg.  In February 2009, CBC Radio 3 participated with Exclaim! and aux.tv to launch X3, a new collaborative cross-promotional platform which sees all three outlets air feature content spotlighting a particular "Artist of the Month". X3 artists of the month have included K'naan, Malajube, Thunderheist, Japandroids, Apostle of Hustle, The Rural Alberta Advantage, Owen Pallett, and Jenn Grant.  In addition to the service's conventional radio programming, any song in the network's music library can also be played on demand from the artist's profile page on the site. In May 2011, Joel Plaskett became the first artist in the network's history to reach one million on-demand plays.  In 2012, CBC Radio 3 was integrated into the new CBC Music service.

Did they do any webcasts after Icecast?
X3,