Apparatus for a voice over ip (voip) telephony gateway and methods for use therein

A device (200) is telephone system and method for accompany for; the telephone gateway) is in a first terminal of data network connection, a invention is made of forming, wherein each terminal and lash for example is a private branch exchange (PBX (14,44), a automatic for example is a telephone relation of voice data, and a an between two coordinating PBXs, wherein a common telephony networks (PSTN (20) by a a data network (30) circuit, which is according to is used to process and consideration and called party of each and a conversation telephone number particularly, and monitoring at the timeA service quality (QoS) of the data network providing, and responded the tendency the switching on and QoS, according to needed switch ('auto-switching') and a conversation is between the PSTN and data area networks, wherein a conversation is bused, and time is provided with a connection of enough QoS. And used for supporting auto-switching, wherein the device is a plug with a command signal for call with nothing is made of as the call special information of non-standard data in each male knowledge H.323 message, the H.323 message of the transmission the gateways of the are. Furthermore, increase the locality's redundancy, the device for coordinating edge (430,430 ') is a H.323 management domain.