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System and method for supporting DTMF tone sending in IP based GSM network

A technology of GSM network and signal tone, which is applied in the network field based on the Internet protocol, and can solve the problem of not being able to send DTMF signals reliably

Inactive Publication Date: 2004-04-21
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when an IP network is used as the backbone for GSM calls, those calls using that IP network will not be able to send DTMF signals reliably

Method used

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  • System and method for supporting DTMF tone sending in IP based GSM network
  • System and method for supporting DTMF tone sending in IP based GSM network
  • System and method for supporting DTMF tone sending in IP based GSM network

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Embodiment Construction

[0020] Detailed Description of Preferred Embodiments

[0021] FIG. 1 shows a prior art GSM network, indicated generally at 100 . Within network 100, MS 120 communicates with Base Transceiver Substation (BTS) 130 via wireless communications (represented by a lightning line in FIG. 1 and elsewhere). BTS 130 then communicates with a base station controller (BSC) 140 . BSC 140 then routes communications between BTS 130 and Mobile Switching Center (MSC) 150 . Although only one BTS 130 is shown in the figure, in a typical GSM network there may be multiple BTSs connected to a BSC. Likewise, multiple BSCs are typically attached to one MSC 150. The MSC 150 is then connected to a standard GSM-based network backbone which forwards the call from the MS 120 to the destination device over the destination network 160 (which may be PSTN, IP or a mobile phone network).

[0022] In prior art GSM, DTMF tones are not sent directly by the MS. This is because if a DTMF tone is sent by the MS, ...

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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.

Description

technical field [0001] The present invention relates generally to telecommunications, and more particularly to the sending of Dual Tone Multi-Frequency (DTMF) tones to Internet Protocol (IP) based networks over the Global System for Mobile Communications (GSM) with an IP backbone (also known as trunk) systems and methods. Background of the invention [0002] Dual Tone Multi-Frequency (DTMF) tones are used, for example, to allow a telephone network user to direct the operation of an Advanced Intelligent Network (AIN). Traditionally, in the PSTN, DTMF tones are generated by the handset. For example, International Patent Application No. WO 97 / 50262A (NORTHERN TELECOMLTD. Northern Telecom Company) (1997-12-31) dated December 31, 1997 describes a method for interfacing standard telephone equipment to a wireless communication system. systems and methods. Thus, using Nortel's method, after a call setup message has been sent, DTMF tones generated by standard telephone equipment a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W88/18
CPCH04W88/181
Inventor E·瓦伦蒂尼L·戴维森H·哈梅莱尔斯
Owner TELEFON AB LM ERICSSON (PUBL)