A communication terminal comprising: a first communication component configured for communication using a first radio access technology; a second communication component configured for communication using a second radio access technology; wherein the first communication component is configured to communicate speech data of a call using the first radio access technology; a first buffer, configured to manage jitter of the first radio access technology; a second jitter buffer, configured to manage jitter of the second radio access technology; and a controller configured to control the second communication component to generate transport protocol packets comprising speech data of the call for uplink transmission of the speech data using the second radio access technology; to switch the call from the first radio access technology to the second radio access technology after the second communication component begins generating the transport protocol packets for uplink transmission; to transfer unplayed transport protocol packets from the first buffer to the second buffer with a protocol packet timestamp for a next protocol packet; and to reorder unelapsed transferred protocol packets for inclusion with protocol packets received on the second communication component. a first communication component configured for communication using a first radio access technology; a second communication component configured for communication using a second radio access technology; wherein the first communication component is configured to communicate speech data of a call using the first radio access technology; a first buffer, configured to manage jitter of the first radio access technology; a second jitter buffer, configured to manage jitter of the second radio access technology; and a controller configured to control the second communication component to generate transport protocol packets comprising speech data of the call for uplink transmission of the speech data using the second radio access technology; to switch the call from the first radio access technology to the second radio access technology after the second communication component begins generating the transport protocol packets for uplink transmission; to transfer unplayed transport protocol packets from the first buffer to the second buffer with a protocol packet timestamp for a next protocol packet; and to reorder unelapsed transferred protocol packets for inclusion with protocol packets received on the second communication component. control the second communication component to generate transport protocol packets comprising speech data of the call for uplink transmission of the speech data using the second radio access technology; to switch the call from the first radio access technology to the second radio access technology after the second communication component begins generating the transport protocol packets for uplink transmission; to transfer unplayed transport protocol packets from the first buffer to the second buffer with a protocol packet timestamp for a next protocol packet; and to reorder unelapsed transferred protocol packets for inclusion with protocol packets received on the second communication component.