Patent ID: 7058079

Claim:
A method for setting up a call with bit-rate allocation in a multiple bit-rate transmission channel enabling a call to be conveyed between a central module ( 33 ) and a remote module ( 37 ), said multiple bit-rate transmission channel comprising at least one first transmission channel according to a primary bit rate and at least one second transmission channel according to a secondary bit rate that is distinct from said primary bit rate, said method being designed to be implemented notably to convey a call between a calling module and a called module, said call being set up according to a setting-up process comprising the following steps: a first step ( 11 ) for the sending of a call signal by said calling module; a second step ( 12 ) for the sending of a response signal by said called module; a third step for the sending, by said calling module, of a signal of acknowledgment of said response signal; a fourth step ( 18 ) for the negotiation of transmission characteristics between said calling and called modules; said method further comprises the following steps: a phase for the setting up by default of said call on a first primary bit-rate transmission channel; a phase ( 13 ) of listening and searching for a signal indicating a secondary bit-rate requirement; and, assuming a detection of said signal indicating a secondary bit-rate requirement, a phase ( 110 ) for the switching of a bit rate from said first primary bit-rate transmission channel to said secondary bit-rate transmission channel, said bit-rate switching phase ( 110 ) being associated with a step ( 111 ) of masking of said acknowledgement signal for a predetermined making period ( 431 ), wherein said response signal is sent by said called module during a predetermined maximum response duration ( 414 ), before said fourth negotiation step ( 18 ) is undertaken, the sending of said acknowledgement signal triggering said fourth negotiation step ( 18 ), characterized in that said masking step ( 111 ) inhibits said premature triggering of said fourth negotiation step ( 18 ).