The cellular text telephone modem - the solution for supporting text telephone functionality in GSM networks. - Matthias Dörbecker; Karl Hellwig; Fredrik Jansson; Tomas Frankkila (ICASSP, 2001)

Realization and Performance Evaluation of IMS Multimedia Telephony for HSPA. - Stefan Wänstedt; Mårten Ericson; Kristofer Sandlund; Mats Nordberg; Tomas Frankkila (PIMRC, 2006)

System aspects of the 3GPP evolution towards enhanced voice services. - Stefan Bruhn; Tomas Frankkila; Frédéric Gabin; Karl Hellwig; Maria Hultström (GlobalSIP, 2015)