Procedure for exchanging useful information generated according to different coding laws between at least 2 pieces of user terminal equipment
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Abstract
If TDM connections are through-connected from the originating TDM network to the target TDM network via a data network in the form of backbone, e.g. VoIP, the switchover between the TDM network and the data network takes place via media gateways. As is the case with connections exclusively between TDM, the coding algorithms of the A face and the B face have to be identical. In TDM networks, coding is done according to A Law and μ Law. When switching from an A Law network to a μ Law network, the coding specifications have to be converted. In order to carry out a conversion in a TDM environment, at the switchover point the μ Law face has to convert to A Law. The same applies to VoIP. The invention relates to the integration of this switchover conversion rule in the codec negotiation procedure so that in principle a μ Law A face offers μ Law and, alternatively, A-Law to the B face; a μ Law B face accepts μ Law whereas an A-Law B face acknowledges A-Law. Furthermore, 64 kBit/s unrestricted preferred connections are considered in fall back mode, wherefore an additional logic is integrated into the codec modification procedure by means of which in principle μ Law and, as an alternative, A-Law are offered to the B face in addition to the transparent CODEC or instead of offering a μ Law A face to the TMR only. The B face first accepts the transparent CODEC on the basis of the list or the TMR ‘64 kBit/s unrestricted preferred’. When receiving the TMU, the B face selects the Codec to satisfy the code conversion rule.
60 Citations
42 Claims
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1-21. -21. (cancelled)
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22. A method for exchanging useful information generated according to different coding laws between at least 2 pieces of user terminal equipment, comprising:
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defining an A side according to a first coding law;
defining an B side according to a second coding law;
transmitting the useful information via a plurality of transmission units that form an interface between a first and a second transmission network and are controlled by control units;
processing signaling information assigned to the useful information by the control units, wherein the information is exchanged via a signaling protocol having a CODEC negotiation procedure; and
providing an additional logic in the CODEC negotiation procedure to convert the useful information to be exchanged according to the coding law of the receiving user terminal equipment. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for exchanging useful information generated according to different coding laws between at least 2 pieces of user terminal equipment, wherein according to a first coding law an A side and according to a second coding law a B side is defined, comprising:
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transmitting the useful information with a first bandwidth via a plurality of transmission units that form an interface between a first and a second transmission network and wherein the transmission units are controlled by control units;
processing signaling information assigned to the useful information by the control units, wherein the information is exchanged via a signaling protocol having a CODEC negotiation and modification procedure; and
providing a further logic in the CODEC negotiation procedure so that when switching over to a second bandwidth, the useful information to be exchanged is converted to the coding law of the receiving user terminal equipment. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification
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Current AssigneeNokia Siemens Networks GmbH & Company KG (Nokia Corporation)
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Original AssigneeNokia Siemens Networks GmbH & Company KG (Nokia Corporation)
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InventorsSabrowski, Sven, Stupka, Jean-Marie, Hoffmann, Klaus
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Application NumberUS10/497,112Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current370/466CPC Class CodesH04L 65/103 in the networkH04L 65/1043 Gateway controllers, e.g. m...H04M 7/0072 Speech codec negotiation H0...H04M 7/122 where the PSTN/ISDN access ...H04M 7/123 where the packet-switched n...
