System and method for supporting DTMF tone sending in an IP based GSM network
AssigneeEricsson Inc.
InventorsEric Valentine, Lee Davidson, Heino Hameleers
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Abstract
The present invention provides a system and method for reliably transferring Dual Tone Multiple Frequency (DTMF) signals originating at a MS through an IP based GSM network. In general, when a MS sends a DTMF request, it is processed in the IP network by a logical application module in a MSC, which, based on the disclosed processing, activates another logical application module in an appropriate gateway (for independent, remote, tone generation), and then the logical application module in the gateway directs the production of the DTMF signal towards the interworking or destination network.
Claims25
A system for sending Dual Tone Multi-Frequency (DTMF) tones through an Internet Protocol (IP) based transport network in a Global System for Mobile Communications (GSM) network, the system comprising:
- a mobile station for generating and sending a Direct Transfer Application Part (DTAP) to a mobile switching center (MSC);
- said MSC having a first logical application module (LAM), configured for receiving said DTAP message and converting the DTAP message into a device control message;
- and
- a gateway communicably coupled both to the MSC and the IP based transport network, said gateway having a second LAM configured for receiving said device control message, directing the generation of a DTMF tone towards a destination network, transmitting said DTMF tone;
- detecting whether said transmission was successful and sending a failure message to said first LAM if said transmission is unsuccessful.
A method of communicating Dual Tone Multi-Frequency (DTMF) tones to an Internet Protocol (IP) based network through a GSM network having an IP backbone, comprising the steps of:
- a DTMF MSC Processor (DMSCP) receiving a Direct Transfer Application Part DTAP DTMF command from a GSM compatible mobile phone system;
- said DMSCP converting the DTAP DTMF command into a device control message;
- selecting a DTMF tone generation method compatible with a destination network
- responsive to instructions from a DTMF Media Gateway Processor (DMGP), generating a DTMF tone receivable by a destination network;
- transmitting the DTMF tone to a destination device in the destination network upon direction from said DMGP;
- detecting whether said transmission was successful;
- and
- sending a failure message to said DMGP if said transmission is unsuccessful.
Dependencies are inferred from the claim text.