| 摘要 |
A demonstration telecommunication system can be utilized with a public switched telephone network (PSTN) operating in a first format. The demonstration telecommunication system allows a telecommunication network operating in a second format to communicate with the PSTN. The first format is different than the second format. The demonstration communication system includes a null bearer system including a PSTN interface for the PSTN and a telecommunication network interface for the telecommunication network. The null bearer system can be utilized with an avionic telephone system.
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