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How to send special numbers through ISUP message during a existing call.

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Deepanshu
How to send special numbers through ISUP message during a existing call.

During a exisitng call, is this possible to send special number like 15620 to the MSC through any ISUP messages,
i have checked all the ISUP message parameter but not able to find out. so kindly suggest, which message can carry this information.