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no ringing tone (DTMF callerid)

I Found the following with yeastar N412 and TA400 models:

When you call the system from outside via voip trunk, you hear no ringing tone until the DTMF caller ID is transmitted to the analog extensions. If you select FSK caller ID the issue cannot be noticed.

The system sends the ringing tone back to the caller when the (DTMF) CallerID transmission to the phones is completed, until that time the caller hear nothing and is thinking the phone is not working.

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