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DTMF with 3rd party SIP phones

DTMF with 3rd party SIP phones

DTMF with 3rd party SIP phones

As some of us may know; 3rd party sip phones can't use the DTMF codes which are defined in the features.
Samsung ITP phones use them just fine, however i'm trying to find a workaround to get the 3rd part sip phones working with DTMF anyways.
Everything I tried resulted in failure and i'm about to advice to use Samsung phones.. Does anyone know a good solution or has an idea that I can try?

I mainly tried to let the 3rd party sip phones call to the SVMI which redirects it to a virtual phone which is forwarded to the actual DTMF code but it did not work in any way.

thanks in advance and sorry for my bad english as I am not a native speaker.

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