Patent ID: 7792143

Claim:
A network processing device, comprising: a processor in a first gateway sending a text relay suggestion message over a packet switched network to a second remote gateway when operating in an audio mode even when the processor knows that the remote gateway receiving the message does not support a same modulation or when the processor does not know what modulations are supported by the remote gateway, wherein the text relay suggestion message suggests to the second remote gateway to convert modulated voice signals received from an associated endpoint into text and convert text received from the first gateway into the modulated voice signals used by the associated endpoint; and the processor switching to a text relay mode, in which packets containing a text payload are relayed from the processor over the packet switched network to the second remote gateway, when the text relay suggestion message is accepted by the second remote gateway, wherein the processor determines that the text relay suggestion message is accepted when the text relay suggestion message is initially rejected and then re-proposed by the remote gateway after the remote gateway determines that the text relay mode can be successfully performed.