Patent ID: 7336944

Claim:
A method for monitoring a call, originating from a cellular telephone modem (CTM) device and terminating in a destination network, in a system including a converter operative to convert call content from a CTM format to a Teletype for Telephone Devices for the Deaf (TTY/TDD) format and a Call Content Delivery Unit (CCDU), the method comprising: receiving the call in a media gateway of a mobile switching center (MSC); recognizing the call as having call content in CTM format by the MSC; recognizing the call as being a monitored call by the MSC; instructing the media gateway by the MSC to establish a first bearer path to the converter; establishing the first bearer path; instructing the media gateway by the MSC to establish a second bearer path from the converter to the CCDU; establishing the second bearer path; instructing the media gateway by the MSC to establish a third bearer path from the CCDU to the destination network; establishing the third bearer path; delivering the call content in CTM format to the converter on the first bearer path; converting the call content in CTM format to call content in TTY/TDD format by the converter; delivering the call content in TTY/TDD format to the CCDU via the second bearer path; collecting the call content in TTY/TDD format by the CCDU; and, delivering the call content in TTY/TDD format to the destination network via the third bearer path.