There is the i.MX6 SABRE SDP reference design by Freescale. It allows a 3G module connection. It can run Android that supports the telephony features. I think, all this together can be considered as the telephony application reference. For more information, please refer to the i.MX6 SABRE SDP web page:
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=RDIMX6SABREPLAT
Have a great day,
Artur
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