Instant message exchange system, between transmission system suitable for IP transmission and a system suitable for telephony between first and second terminals via message server

摘要

Instant messages are exchanged between a IP transmission system (3) and a transmission system suitable for telephony (4) between first (1) and second terminals (5) via a message server (9). The first user keys in a message, and possibly the delivery address, via the first data terminal (1). Via the message server, using an internal conversion unit (11) or an external conversion server, the message is converted to a corresponding speech version, which can be presented audibly through the second telephone terminal.