| 摘要 |
This invention relates to interfaces between facsimile machines and cellular telephone systems (including both cellular subscriber terminals and the fixed part of the system, such as the mobile switching center and the interworking function). The cellular radio telephone system could for example be GSM. To prevent two different facsimile machine timers (specified in the CCITT T.30 recommendation) from expiring during the communication between two such machines connected to the GSM environment, a timer reset command (e.g. a command repeat signal) is automatically sent by the interface (12 or 15) to the facsimile machine on receipt of the command from the facsimile machine, for causing the machine to repeat its command so as to allow time for receipt of a response from the other machine. Instead of sending this response only if a command is not recognized (as recommended in T.30), it is used as the default response whenever the GSM environment receives a command from a facsimile machine. If necessary this response can be used twice. |
