Telefonaktiebolaget Lm Ericsson (publ)

Nortel Networks Corporation

Peter Yue

Pierre Gendron

Emmanuel Grecki

Hung Ma

A communication node processes a call supported over a voice coded channel in a wireless communication network. The node tentatively designates the call as a voice call as soon as the call is initiated. While the call is designated as a voice call, the node limits processing of the call as a text telephony call to passively monitoring for one or more partial or complete text characters in the call. Responsive to detecting one or more partial or complete text characters in the call via this passive monitoring, the node designates the call as a text telephony call. While the call is designated as a text telephony call, the node fully processes the call as a text telephony call by passively detecting one or more complete text characters in the call, and conditioning and de-conditioning signals of the call for reliable transmission and reception over the voice coded channel.

Limiting processing of calls as text telephony calls

A wireless communication device capable to transmit and receive TTY/TDD characters. The wireless communication device includes a receiver and a transmitter to allow for a full duplex communication. The receiver is responsive to the reception of a data frame including a TTY/TDD silence message to switch to lower data rate operative state where the receiver expects to receive and process data frames at a lower data rate. At the same time the receiver causes the transmitter to switch to a lower data rate operative state and also to return to the remote site with which the wireless communication device communicates a TTY/TDD silence message. The purpose of this TTY/TDD silence message is to set the receiver at the remote site at the lower data rate operative state.

Growing community of inventors

St-Laurent, Canada

Peter Yue