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| Number | Title | Issue Date |
| 5448617 | Method of processing intelligent network service call with DTMF subscriber signalling in electronic switching system for toll/tandem A method of processing an intelligent network service call in a service switching point (SSP) which has a DTMF processor and is connected to the originating local exchange/transit exchange to provide an intelligent network service. The SSP receives a digi... | 09/05/1995 |
