| 摘要 |
<p>A method for establishing a communication over a packet based network, for example a Voice over IP (VoIP) call, is disclosed, which is initiated by a PSTN telephone call (3) from a caller (1) to a recipient (2), whereby both the caller (1) and the recipient (2) are equipped with VolP-enabled phone terminals (10, 20). A telephone call (3) over the PSTN between said caller (1) and said recipient (2) and a dialogue (4) within the audio channel of the PSTN telephone call (3) between the recipient's and caller's phone terminals (20, 10) is established. Said dialogue (4) comprises a plurality of audible signals emitted within the voice channel both by said caller's phone terminal (10) and by said recipient's phone terminal (20), whereby said audible signals will be automatically captured by the non-emitting terminal (10, 20). Said dialogue (4) allows the conditions of a connection over a VoIP-channel to be negotiated. Thereafter, according to the conditions negotiated, the connection over a VoIP-channel between the caller's phone terminal (10) and the recipient's phone terminal (20) is established, which then replaces said PSTN telephone connection (3).</p> |
